Average returns mask diminishing marginal efficiency
Mike Jason notes historical average return on ad spend is flawed for planning. A tactic might yield a two dollar average, but the final dollar spent could return only seventy-five cents. Similarly, view-through impressions often claim credit for existing customers, creating false optimization signals.
Why it matters. Chasing high average returns leads to over-investing in saturated bottom-funnel tactics. This destroys profit margins and wastes capital that could fund upper-funnel growth or net-new prospecting.
Your next move · Podafi’s suggestion
Shift media reviews from average return on ad spend to marginal return. Pull back spend on tactics where the incremental dollar yields less than one dollar in return.
The catch. Calculating true marginal return requires sophisticated incrementality testing. Simple platform dashboards only report average returns and will mislead your optimization.
Evidence & 2 sources
Evidence summary · paraphrased
Jason explained that a two dollar historical average return is useless for planning if the marginal return on the last dollar spent is only seventy-five cents, signaling overspending.