Paying users can be incredibly entitled, sometimes even more than people who don’t pay you a dime. The problem is the moment you accept a cent people expect you to do work for them, regardless of whether the money is actually “worth” how much effort needs to go into a feature. The open source projects I’ve worked on get donations but sometimes people will put up like $10 for their pet feature which takes a week to write. Like, thanks for your contribution, but this actually doesn’t affect my priorities at all.