They may not make a personal paycheck, but they are no doubt lavished with gifts, large sums of cash, fine dining, and never have to lift a finger.
I mean, if a circuit overseer rakes in a decent amount of cash via green handshakes, what do people hand the GB members?
They never have to pay a single penny for anything in their lives. They're always with at least one sycophant who will step on their grandmother to say "no brother, let me buy that for you."
Edit: So I'd say money is definitely a factor. Plus worship and adoration. Pretty awesome gig. All you have to do is become a sociopath.