ROAS Limitations: Five Strategic Blind Spots Your ROAS Report Will Never Show You | Left Hand Agency CPG High Five

Last week we talked about how ROAS misreads attribution, and the ways platform-level reporting can give CPG brands a false sense of confidence about what's actually driving sales. If you missed it, worth a read.

But attribution problems are only half the story. The other half is what ROAS does to your strategic thinking over time. Because when a metric gets elevated to the primary measure of success, it starts shaping decisions in ways that aren't always obvious until the damage is done.

These next five blind spots are less about what ROAS gets wrong in the moment, and more about the habits it creates. The budgets it quietly kills. The growth it leaves on the table. And why some of the smartest CPG marketers I know have stopped treating it as the headline number.

Here are five more reasons to hold your ROAS reports a little more loosely.

1. ROAS Ignores Customer Lifetime Value

Anyone who has spent time on the e-commerce side understands this one intuitively. When you're selling a consumable product, acquiring a new customer costs more upfront. But if they stick around, that initial investment pays back many times over.

Think about pet food. People don't switch their dog's food easily. If you can get a new pet owner to try your brand, you've potentially locked in years of repeat purchases. My own dog is five and has only been on a handful of brands his whole life. The acquisition cost looks high on day one. The lifetime value tells a completely different story.

The challenge for CPG brands is that e-commerce has always been able to prove out lifetime value through direct order data. CPG doesn't have that luxury. It's not like anyone is filling out a form when they grab a bag of Skittles at checkout.

But just because LTV isn't readily measurable doesn't mean it shouldn't be part of the conversation. Many platforms now offer "new to brand" metrics, and while those aren't perfect, they add important context to ROAS numbers. A new customer acquired at a higher cost isn't a media failure. It might be the best investment you made all quarter.

ROAS will never show you that. It just sees the cost and the immediate return, and calls it a day.

2. Price Point and Margin Make ROAS Benchmarks Nearly Meaningless

One of the most common questions we get from CPG brands is "what's the benchmark?" And the honest answer, which not every agency will give you, is: there isn't one. Not a meaningful one anyway.

ROAS is impacted by so many variables that providing a universal benchmark is hubris. Your price point, your margins, your retailer mix, your trade spend obligations, whether a particular RMN is folding their own margin into their reporting. It's messy. And a category-level benchmark is usually too broad to be applicable to your specific business.

The reason most agencies provide benchmarks anyway is simple. Clients ask for them and agencies feel obligated to answer. But a number pulled from an industry report or a competitor's category tells you almost nothing about what your brand should expect.

The better approach is to work with your CFO to build your own target from the inside out. Look at your pricing, your COGS, your trade spend commitments, your margins across retailers, and your expected repeat purchase rate. Back into a number that reflects what you can actually afford to spend to acquire a customer and still run a healthy business.

And then give it time. That target ROAS won't be there in month one. It shouldn't be. Month one is when you're just starting to understand how your media dollars are actually performing. Pull the plug too early and you'll never get the optimization data you need to make the investment work.

There is no benchmark except yours. And you won't know what it is until you start.

3. Seasonality Gets Mistaken for Media Efficiency

There's some real logic to leaning into performance media when demand is naturally strong. If people are already looking for your product, your media dollars are going to work harder. That's not a mistake, that's smart allocation.

The mistake is misreading that seasonal lift as proof that your media strategy is firing on all cylinders, and then making budget decisions based on a number that was always going to look good in October.

Think about canned pumpkin. Come November, Instacart ROAS on Libby's is going to be efficient. People are making pies. They're searching, they're buying, the conversion is easy. Come January? Completely different story. That's not a media problem. That's just how calendars work.

The candy cane problem is even more specific. If you're a seasonal product with a natural 12 month purchase cycle, every customer who shows up in your peak season is going to be flagged as a lapsed customer. Because no platform is running a 12 month lookback window. So your incrementality numbers look strange, your new versus returning customer data gets murky, and your ROAS swings wildly between seasons for reasons that have nothing to do with your media.

The answer isn't to go dark in the off-season. It's to build your ROAS targets and monthly budgets around your seasonality from the start. Lean in when efficiency is expected to be high. But don't abandon the shoppers who might buy you out of season. And never let a strong November convince you that your media is more powerful than it actually is.

4. ROAS Flattens Brand and Performance Into the Same Conversation

A dollar spent on a CTV awareness campaign and a dollar spent on a sponsored search placement are not doing the same job. One is building the mental availability that makes a shopper reach for your brand six weeks from now. The other is making sure they don't defect at the moment of purchase. Measuring both against the same ROAS standard is like judging a foundation by the same criteria as a roof. They're both part of the same house but they serve completely different functions.

When we're running awareness media for a client we look at sales lift to capture the holistic short-term impact on growth, and brand health metrics like awareness and affinity to track whether we're heading in the right direction for the long term. Those are the right instruments for that kind of investment. ROAS isn't.

The deeper problem is that many CPG brands don't have enough budget to run both brand and performance simultaneously, so they default to performance only and expect it to carry the full weight of growth. It won't. Performance media captures demand. Brand media creates it.

There are years of research backing up the right balance between long and short term media investment. The problem isn't the evidence. It's that brand investment takes time to compound, and CFOs understand compounding in theory but also have shareholder value and annual profit goals to answer to. Those things don't always reconcile in year one.

It's probably one of the biggest sources of tension in the real world of advertising. And ROAS sits right at the center of it.

5. ROAS Trains You to Optimize to Platforms Instead of Your Business

If there is one thing to take away from both of these posts, it's this: start with the business outcome you are actually seeking. Not the platform metric. Not the benchmark. The real business outcome.

Sometimes that's long-term sales growth. But sometimes it's velocity, because you need stronger numbers to earn more shelf space. Sometimes it's a compelling story for your next investor meeting. Sometimes it's proving product-market fit because you're positioning the brand for acquisition in two years. These are all legitimate goals. They just require completely different media strategies and completely different ways of measuring success.

ROAS will never tell you which of those goals you're actually serving. It only tells you what happened inside a single platform during a specific window of time. And when marketers optimize to that number without anchoring it to a broader business outcome, they end up making decisions that look smart on a dashboard and confusing on a balance sheet.

Here's the hard truth about performance media: you are renting those customers. The second you stop paying rent, you get evicted. Performance media can absolutely be part of a smart strategy. But if it's the only strategy, you're building on borrowed ground.

The best media investments we've seen come from brands and agencies that are deeply aligned on what growth actually means for that business, at that moment, with that budget. How you define success should drive how you spend. Not the other way around.

ROAS is a tool. A useful one. Just make sure it's working for your business goals, and not the other way around.

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How ROAS Limitations Shape Decision Making

ROAS isn't going away. And: it shouldn't. But ROAS limitations are real and the brands that grow over the long term are the ones that know what it can tell them and, just as importantly, what it can't.

If these past two newsletters have a single throughline it's this: always start with the business outcome you are actually seeking. Not the platform goal. Not the benchmark someone else handed you. The real thing your business needs right now. Then build your media strategy, your measurement framework, and your definition of success around that. ROAS can be one input into that picture. It just shouldn't be the whole frame.

The metrics you choose to optimize to will shape the decisions you make. Make sure they're working for your business, not the other way around.

Next steps? We'd love to talk through what your current ROAS reports are actually telling you, and what they might be missing. That's exactly the kind of conversation we have with CPG brands every day.

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We are Left Hand Agency, a boutique media buying agency built for CPG brands. We help brands make smarter, more holistic media investments across retail media networks, out of home, CTV, paid search, and streaming audio. If your media strategy needs a second opinion, we should talk.