Some of them make quite a bit -- especially when considering their work load.

At 2 state colleges, I personally know of at least 4 professors who are making over 100K per annum and who are not even teaching full work loads -- this at a time when one of the colleges is in severe financial straits, to the point they laid off the majority of their support/maintenance staff as well as some of their adjunct instructors (which, along with the un-tenured, is where the "professors make very little money" comes from -- nah, they usually don't get paid for shit; I know, I was one). This also happens within public schools.