The cost of maintaining different versions of apps for different tiers of payees seems prohibitive. Especially when libraries change constantly.
Maybe I’m wrong and your system would work fine. It doesn’t seem right to me though.
Personally, I think subscriptions are the way forward, just lower cost subscriptions. Why is 15 a month such a standard? Most of the 15/month apps I shell out for feel more like 3/month or 4/month apps.