I think this is exactly what drives him.
I am ashamed to admit if I had the money he had when 24, I would have retired to some exotic places or relentlessly travelling the world.
Hes instead running two of the most disruptive firm in the world working 80 hours week.
Im not ashamed to admit that I would have retired too.
Some people need to be on the go all the time, its what keeps him relatively sane probably.