Rocket science is really cool. Rocket scientists are huge geeks about rocket science. If there are really only a handful of organizations hiring rocket scientists (and most of them are run by megalomaniacs or deeply entwined with the MIC), you're faced with the prospect of working for a bad company, or not working on your passion that you specialized in.
I remember some AMAs from The Site That Shall Not Be Named by SpaceX employees, and a common comment was that they do their best to keep him distracted so they can do their actual work because his ideas are stupid.

