The great thing about open source is that anyone can participate for free and for whatever reason: some for the feeling of giving back, some for creating someth

The great thing about open source is that anyone can participate for free and for whatever reason: some for the feeling of giving back, some for creating something useful for others, some like it as challenge, some for the street cred., etc. and most people don't expect to be paid. The idea of paying for OS cannot exist in such environment until everyone is on board with that idea. If you create something and demand to be paid, someone will most definitely create something similar and release it for free.