> That's not true. If your ad placements don't perform, people are not going to book them.

You'd be surprised at how opaque and complex ad attribution and ROAS calculation has become for the average business, and how many marketing departments are operating on high-level metrics without having an intuitive understanding of how their ads are performing. Many of them rely on the ad networks' own metrics to determine ad performance, and don't even have their own internal attribution models.