Elon Musk could surely easily hit the limit without all of his current ventures. What would be the incentive for him to continue to innovate once he's reached t

Elon Musk could surely easily hit the limit without all of his current ventures. What would be the incentive for him to continue to innovate once he's reached the limit? As far as I can tell, he does not have a history of taking all the money and blowing it on himself. Whatever he's still working for, it's not because he wants extra money for spending. He clearly has some motive other than just wanting more money to blow.