A Healthy Blended ROAS Can Hide a Bad Scaling Decision
Blended ROAS is reporting. Marginal ROAS is allocation. The average can stay flat while the economics of the newest spend get worse.
A healthy blended ROAS can hide a bad scaling decision.
Your mature cohorts are still generating revenue. Stronger campaigns and markets are carrying their weight. The blended ROAS across the portfolio can therefore stay flat — or even improve — while the economics of the newest spend are getting worse.
That matters when someone asks: should we increase the budget again?
At that point, the historical average is useful context, but it is not enough. You need to understand what happened at the edge of scale.
Questions for the edge of scale
- When you moved from one spend level to the next, where did the additional money go?
- What did those additional cohorts cost?
- At equivalent maturity, what are they returning?
- Does their expected payback still clear the return you require?
This is also why simply slicing blended ROAS by source or cohort does not automatically give you marginal ROAS. You are trying to isolate the economics created by the incremental spend, not just segment the average more finely.
A game can therefore have a healthy blended ROAS and still be approaching its current scale ceiling.
Do not give a campaign more budget because the average still looks healthy. Give it more budget because the next block of spend still earns an acceptable return.