It's hard to keep all people happy when it's down to pricing.I think mission planner I'd a great app I just don't like being trapped for everything in bits and pieces. The app marketers are being cheezy. One price includes all. It's annoying. And I know I spent 2300 bucks for the quad, what's a few more bucks. I have already spent over $35 on apps in the past month I probably will never use.
Some people prefer AIO subscription instead of paying in full upfront, because they don't know whether the app or add-ons are useful or not. Some prefer to use certain features but not all, such as Camera, Mission Planner or FPV Goggles alone. If we group everything together with a higher bundle price, I'm almost 100% sure some people think being trapped as well if they are only interested in certain features. Thus, we opt for a more flexible pricing to let users choose what they want/need.
I think you understand the feeling as what you said "I have already spent over $35 on apps in the past month I probably will never use." though I'm unsure what did you buy last month.