C'mon, you don't really believe that. Do you think Stevens left because he had always dreamed of coaching the Celtics and went there for the same or less money? Of course not, he left because of the cash! There is nothing magical about Butler, they will lose coaches for more money just like any other school.
Although, there is some extra appeal for an opportunity to coach one of the two top franchises in the NBA.....well, at least before Dr. Jerry Buss passed away.....that alone wouldn't appear to be enough of an enticement. And the $$$ just gets bigger with the NBA now being flush with it.
Who else high-profile has walked away from a good college gig to the NBA? Calipari, Pitino, Donovan......Hoiberg....right off the top of my head.