The Comfortable Lie of High ROAS
Every month, agencies report ROAS numbers. Clients nod approvingly. Everyone feels good.
But here's what nobody wants to talk about: a high ROAS doesn't mean you're making money.
I've audited accounts with 8x ROAS that were losing money. And accounts with 3x ROAS that were printing cash.
The difference? Understanding what ROAS actually measures—and what it deliberately ignores.
What ROAS Doesn't Tell You
ROAS is Revenue ÷ Ad Spend. Simple. Clean. Dangerously incomplete.
It doesn't account for:
- Product costs (a £50 sale with 10% margin is very different from a £50 sale with 60% margin)
- Returns (that 8x ROAS drops to 4x when 30% of orders come back)
- Cash timing (revenue today, payment in 45 days, ad spend in 2 days)
- Customer acquisition vs. retention (are you paying to acquire new customers or just reactivating existing ones?)
When you optimise for ROAS, you're optimising for revenue regardless of profit. And Google's algorithms will happily find you all the cheap, low-margin sales you can stomach.
The Symptoms of ROAS Sickness
If you've been chasing ROAS, you might recognise these symptoms:
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Your best-selling products aren't your most profitable. Google pushes what converts easily, not what makes you money.
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Returning customers inflate your numbers. That "conversion" was someone who would have bought anyway.
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Your cash flow doesn't match your "performance." High ROAS, empty bank account.
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You can't explain why spend keeps growing. The algorithm found more "efficient" ways to hit targets—usually by cannibalising organic traffic or remarketing harder.
The Alternative: POAS (Profit on Ad Spend)
We measure POAS: actual profit after product costs, returns, and transaction fees, divided by ad spend.
This changes everything.
Suddenly, that high-volume, low-margin product line stops looking attractive. Suddenly, pushing the premium range makes sense. Suddenly, you can see which campaigns are actually building your business and which are just moving money in circles.
What This Means for Your Account
If your agency reports ROAS without any reference to margin, you have a problem. Not because they're bad at their job, but because they're measuring the wrong thing.
This is exactly what we look for in our audits: the gap between reported performance and commercial reality. The difference between "the numbers look good" and "the business is healthier."
When you're ready to see what your account is actually doing to your bottom line, book a discovery call. We'll show you where the numbers tell a different story than the dashboards suggest.