Sequoia balance their SBFs with solid, profitable bets. That means they can keep raising funds, keep paying out carry, and through both of those maintain staying power. I don't love reducing this to economics, but at the end of the day if you can't pay your LPs, you can't pay your GPs, and when you have second-rate GPs you're going to wind up with second-rate founders. Sequoia brings home the bacon. Andreessen lives on management fees.