Research Study
The Scaling Illusion Study
Why ROAS improves while profit stalls
The Belief
"If ROAS is going up, scaling is working."
What We Analysed
15 ecommerce accounts that increased Google Ads spend by 30-100% over a 3-6 month period.
We tracked ROAS, gross profit, new customer acquisition, and spend distribution across branded vs non-branded, new vs returning customers, and high vs low incrementality SKUs.
What We Found
11 / 15
accounts saw ROAS improve
By traditional metrics, 73% of scaling efforts looked successful.
9 / 15
accounts saw profit stall or decline
60% of accounts were paying more to stand still-or worse.
Incremental spend disproportionately went to:
Branded demand
Customers who would have converted anyway
Repeat customers
Existing customers re-acquired at additional cost
Low-incrementality SKUs
Products that cannibalize organic or direct sales
The Pattern
As budgets increased, Google optimised toward certainty, not incrementality.
The algorithm favours signals that predict conversion. Branded searches, returning customers, and already-popular products all convert reliably-so they absorb more spend.
This is rational from an efficiency standpoint. It's also a trap.
The Outcome
ROAS went up
The metric that gets reported looked healthy.
Profit per new customer went down
The metric that matters got worse.
Conclusion
"ROAS is a scaling comfort metric.
Profit tells the truth."
JudeLuxe Rule
Never judge scale without separating incremental profit from recycled demand.
Related Reading
ROAS vs Profit
When ROAS tells you what you want to hear-not what you need to know.
Account Structure Profit Study
Why profit-based SKU clustering outperforms category structures.
When Not to Scale
The signals that tell you scaling isn't the answer.
Spend Governance
How we protect profit when scaling budgets.
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