VCs win if enough of their bets make it big enough to offset the ones that go under. Naturally the big hits are few and the ones that fail are numerous. That means the big hits need to be huge and the failures need to have a certain cap. The latter also means you can't run a company for 10 years in slowmo until they get profitable. And the big hits need to be huge which means they need to take over a nice chunk of a…
I'm thinking about a Planet Money episode that discusses big-time poker folks, and they frequently trade percentages of their winnings such that if enough people do it, the few big winners are evened out over time.