Guys that make 6 & 7 figures have no egos and are not stubborn at all and have no reason to try to prove themselves knowing they still get a fat paycheck every week. Rich people in sports have never been known to be like this.
The official world order of professional intelligence goes like this:
1) Rocket Scientist
2) Brain Surgeon
3) Football Coach
4) Astrophysicist
5)Chemical Engineer
#1 is Rocket Surgeon