Gwern makes many a point here I agree with. In many respects, the hyperactive admins are a problem, for entirely the reasons he makes. These are the people who burn out. These are the people who are most likely to fall victim to 'Wik's disease' - the I Am Irreplaceable conviction.
They're also the people who are most likely to be cut too much slack on account of all their efforts, so that they're not checked early on, and only face censure when they do something incredibly bad.
Some of them will have the strength to resist the stress; many will not.
-Matt