Open source can be summarized by Linux: you need something? Make it yourself if you know how to make it.Teensy and Arduino are another good example, followed by Raspberry Pi; where you are totally free to do what you want with them, even make your own boards from scratch if you so like; and change the designs to your own requirements.
That is the whole point. Then if even 1 person find that useful, you did a favor to that person and the whole point of being open make sense. The toy breaks when you put in the mix the consumer perspective and the obvious mentality of making money.
This goes out of the topic; but in the end if everything was free, you would not need money; so the whole concept of becoming rich would become irrelevant… You would not fight to make something to make money, and the system would just work as a constant open source system where everyone works on everything they can work, because they can help; and everyone benefit from it. It is a nice dream, I know.