Mike,
While none of us has a broad enough sample size to draw broad conclusions, in general, I would think superintendents have more to worry about than the clubs, who IMHO, often have no problem firing them after a bad winter, renovation project, etc. It does seem to go by market. For instance, for years, the same supers were in place in Omaha at the better clubs. In other areas, they get changed out more often than NHL coaches (who have historically short life spans at any one job)
And, in the good times, many job changes were the supers being offered better jobs. With construction down, they seemingly are more interested in staying where they are. (again, in general, there's a million stories out there)
A club employee with tenure is (again IMHO) a sign that they are respected in an above average way by their employers, although, I don't doubt, given the variability in human nature that some let that go to their head, whether pro, super, or GM. Golly, some clubs have kept wait staff around for decades because the members like them.
Do you have any firm idea what % of clubs are afraid of their staff? My guess would be 2%, a number which applies to a lot of odd ball behaviors in the human race......