I had a roommate in college who's Dad was banned by the NCAA from having any involvement with the University of Florida booster club. He was one of Charlie Pell's recruiting financiers during his tenure there. I also know some folks that were wrapped up in the interesting activities of the NCSU escorts during the mid 90's. Bottom line is that the boosters can/will/do more to get a school in trouble than the coaches can even imagine.
As a UNC-Ch alumni, I'm expecting some of that behind our current "tutor writing papers" issue. I could be wrong--we'll see.