Epic expert estimates Apple's App Store profit to be nearly 80%
appleinsider.com
appleinsider.com
Maybe the solution is to keep the current $99/year development tier for completely free apps with no IAP, but also require a $500/year payment for any paid app, and move to a 10% commission.
This would reduce the amount of junk apps being submitted - reducing overheads and customer support for dodgy apps - whilst still delivering a big commercial improvement for developers of paid apps.