A lot of open source software go down the route of having the software free, and paying for guaranteed support and/or funding developers directly in order to get their specific bugs and needs met faster. That's definitely a viable path; the question is, can you make more than just a salary on it? Some companies do, but then you have to get into hiring, managing people, which most hackers don't really have any interest in.
That's a great point. There's a good income to be made by developing tools for developers, just not the type of stellar growth that gets you mentioned on TV (unless you switch from developing for developers to developing for everyone, like Bill Gates and Paul Allen)
