Mozilla is probably the best example of paid developers plus open source contributors.
I've spoken to someone who worked there, and they agreed it was hard to keep the balance - if you start hiring all open-source contributors, then the remaining coders out in the open will get de-motivated, since they weren't offered a job.
I've spoken to someone who worked there, and they agreed it was hard to keep the balance - if you start hiring all open-source contributors, then the remaining coders out in the open will get de-motivated, since they weren't offered a job.