So let's pick a mid-range public research university with mandatory salary reporting. I'm going to go with bio medical engineering at UNC Chapel Hill [1]. These cats are breaking 100k at associate professor. This is also just salary. Most profs I know take in another 30-40k a year between consulting, testifying as experts in court, etc. While 130 +/- 30k a year isn't going to catapult you into the upper echelons of the American elite, a guaranteed gig for life at six figures with benefits is hardly a bad way to live. Could these guys make more money in private sector? Sure. But they certainly aren't hurting either.

[1] http://www.newsobserver.com/2011/02/24/1011452/university-em...