I once had a general chemistry professor that had made a significant amount of money off a patent. He kept a small townhouse near the university and flew his private plane in each week to teach his few classes then would fly home for the weekend. He was no longer burdened with the publish or perish game and was able to focus solely on doing what he enjoyed most. The students got a professor actually focused on teaching and the university got a competent professor willing to teach the least desirable introductory classes. Wins all around.