I beg to differ, I think that if you are knowledgeable enough to know what open source is, what it means and how it works, then you're able to download xcode, build the open source app, bypass the apple store and install it on your device.
After I paid them they continued to support me videos and direct communication to help me use what I'd paid for, and they took seriously the problems I identified.
I'm sorry that you consider this being 'Robbed'. I had my car stolen once, and my house broken into another time, and those things didn't feel good.
If XCode is like any other compilation environment I've ever used, incompatible library versions will be involved, you'll need to download additional libraries, cryptic errors will be produced, environment variables will need to be changed... and the process will take three days before you finally just give up.
Correct me if I'm wrong, and XCode is a magical application where Everything Just Works, but given the frequency with which my iTunes malfunctions, I highly doubt it.