Oh boy, i hope not, im sure hes wealthy enough by now,
He will have a great life by staying in the UFC and fighting more,
Or even w/o zuffa, GSP will always be rich hes a marketable guy, hes already been a mma champion for a while, im sure he would be fine if he did decide to retire
Would just suck though, he would be missed by many im sure. Hope he sticks around & defends his title some more.