Why he cant just generate indefinite amount of bitcoins for him and exchange it to real cash, right?
The part above of OP is just stupid, but the comparison of Satoshi to Bill Gates is interesting. I strongly suspect there isn't one person who is Satoshi, that it was a collusion of government agencies who came up with bitcoin in an effort to ensnare tax evaders. Don't put anything past those barstards. Who would pass up a Bill Gates-sized pile of cash? Answer: No one in their right mind. And yet Satoshi's coins haven't moved that I know of. Unless he's dead.
Very interesting to contemplate.