A free (ad-supported or fully free) app that's very popular and updated frequently (requiring more reviews) would cost them a lot more than an app that has in-a

A free (ad-supported or fully free) app that's very popular and updated frequently (requiring more reviews) would cost them a lot more than an app that has in-app purchases but only gets updated once a year. Yet the latter app would earn them more. Something doesn't add up here. And yes, that $99/year developer account fee, it exists.