Staff doesn't have that choice - unless, as you said, they quit. Sure, that's always an options, but not
really
comparable.
I don't think that being paid well in exchange for being unhappy, especially if someone is highly stressed or miserable most days, is a good deal. If someone feels that way then I would encourage them to either try to negotiate changes to their work environment internally, or to find a new employer.
This isn't to say that I want to see a mass exodus of employees from WMF or its affiliates, and I get the impression that average job satisfaction at WMF has improved since Katherine took over, but I think that people may have more freedom and opportunities than they may realize if they're feeling trapped and would probably be happier elsewhere.
(Self-disclosure: I once worked as an intern for WMF. It was an interesting and useful experience, but I don't think that I'd want to go back regardless of how much I was paid.)
Pine