The NCAA is so selective in its enforcement, and certain schools (lots of 'em in the SEC) are 'too big to fail'. The notion that Tennessee has remained out of the NCAA's clutches despite all of the documented cheating, phony term paper writing, and the like, is absurd.
OTOH, Ol' Miss has been somewhat of a doormat until recently, and nouveau programs like that are considered fair game. I think we are/were in the same boat. When it comes to illegal inducements, the SEC has always been the nu-cu-lar power in college football, and the NCAA has been loathe to challenge it.
I'm not defending Ol' Miss and certainly not Baylor, but if you substitute names like Alabama and Florida, would the NCAA put on a full-court press? Not as long as schools like that drive TV rights' fees.