He's really stuck between a "rock and a hard place."
He really seems confused, about the fact of not knowing want he wants to be when he grows up, and the the benefit/guilt of collecting millions of dollars from the Bucks while he thinks about it. He's knows he's not gonna give it back. He must actually think poorly of himself in a way.
(I know...we should all have this problem.)
It's simple, he doesn't love basketball, he just seems to not be of a competitive nature at all. Unfortunately, basketball just happens to be the thing he's most suited for.
As good a fit as this guy is for the Celtics, we should stay away from him. This will happen over and over until the money runs out. And unless he's a financial idiot, that will be a long time. Too bad.