The real ROI of celebrity endorsement, and how to model it

Compared line-for-line with a performance campaign, a celebrity fee looks indefensible. But judging brand investment on last-click maths is how brands starve the very trust that makes their performance spend cheaper.

Model the full funnel

A celebrity works across awareness, consideration, trust and conversion at once. Attributing it only to direct sales misses the lift it gives to search, to organic demand, and to the efficiency of every other channel.

Use test and control

The cleanest read is geographic: run the campaign in some regions and hold others back, then compare sales, search and brand metrics. The difference is the endorsement's real contribution.

Price the durability

Content and credibility from a good campaign keep working for quarters. Amortise the fee across everything it feeds — not just the launch week — and the ROI question usually answers itself.