There are 1,122 (as of February 19 2007) users with sysop rights (active and otherwise), 814 of them active (as of January 18, 2007).
How many of these admins, in your opinion, would fit in the category of "power abusers", "hostile to editors", etc?
I don't know if I know 100 of those admins, but I could probably rattle off 10 abusive ones as of that date.
So my projection? Roughly 75-80.
-Jeff