I know this is beside the point you're making, but that guy at the top does not have greater risk.
The right measure of risk isn't money, it's freedom. Work as CEO of Google or Roche for a month and you don't have to work any more. You don't risk shit, you can only win or win bigger.
This is what I don't understand. There are plenty of people who can run a business, so why is it that we pay so much for them? There's a massive queue of candidates who will all do a decent job (you won't know), so why are they paid astronomical sums? There's no way you can be sure a guy is not going to mess things up, and paying him a lot of money won't motivate him more, he's only got a 24h day. He can't go and be CEO elsewhere because he doesn't know other businesses that well, only a few places could logically use him. On top of that a huge proportion of the stock price is not in his hands.