The problem is you are comparing the "elite superstar" entertainers against "average" university professors.
The "average" entertainers, who are mainly waitresses, "Z" list wannabes, and amateur sports people relying on hand outs; are next to nothing when compared to the "average" university professor pay of 150K per year. Life time earning comparisons would be even less considering the short lived, less than ten year life span, of most pro athletes.
Uni professors wins hands down at the "elite" end of the spectrum too. World number one soccer player, Cristiano Ronaldo, earns 200m over just 5 years, playing on average 90 minutes per week, every week. Compare that to one - Dr. Henry Walton Jones, Jr - a college archaeology professor, who'm on any of his few televised treasure hunts, commands an audience of hundreds of millions, and generates billions of dollars revenue.