It can be seen that they spend a lot of time and energy to maintain the normal operation of the forum, and of course many legendary members are not staff. So I feel like they're all doing bitcoin full time.
I'm personally on Bitcointalk a lot, but the "work" I do here is so light that I wouldn't even call it "work".
But to answer your topic question, I'd love to work on this space "full time". But alas, I'd have to venture outside this industry as the cryptocurrency can be really fragile at times and is obviously cyclical.