"A few open-source programmers are fortunate to have jobs writing open-source code
full-time. Others have jobs where enlightened employers allow them to work on particular
open-source projects part-time because the company benefits from advances in these
projects. Still, others enjoy consulting on open-source projects for customers.
Nonetheless, I believe most open-source programmers do not make their living by writing
open-source code." More at InfoWorld.