^ He does it because he can.
Until it starts costing him, either through fines or fouls in the game, he’ll keep on doing it.
It happens in a lot of sports. BJD will probably agree with me that Luis Suarez is probably playing the best soccer in the world right now, but he flops like a fish tossed on the floor of a boat every chance he gets. Refs reward him for it, the same as they do Lebron.