Its proof. You overpay,then the player has no incentive. Not many Lebrons out there. Still has a fire that money can't cool.
But its cooled plenty of others. Like Matt Cain...even Pablo. Zito was King Kool.
On the other hand? You have the A's who abuse fear of the big contract as an excuse to field a team of MLB AAAA quality. And then hope one star results is loved by the fans quickly before he's traded two years later.