I spoke to a fighter that started with Golden Boy, and won a world title and made good money. He jumped to PBC and got paid stupid money to fight Ricky Burns.
In his mind signing with PBC killed his career because, in his opinion, he wasn't getting good fights to keep him interested and excited. You could make a case that all of a sudden having a bunch of money killed his discipline and derailed his career. Maybe it is the same thing.