Top of the funnel discovery and verifying the app won't do malicious things is value. It's debatable if that's worth 30% of all in-app purchases (but then those

Top of the funnel discovery and verifying the app won't do malicious things is value. It's debatable if that's worth 30% of all in-app purchases (but then those also get the value of a trusted payment processor too). But it's silly to imagine that app developers aren't getting value from being in app stores.