But you can improve your expected returns if you get to double down on one of your lottery tickets when you know it has a high chance of winning. You invest little time in the startups that seem likely to be unsuccessful, and a lot more time in the startup that is on a path to success.
Of course every VC, CEO, and founder will say otherwise, since they're incentivized to get people excited about their investment. VCs also place more bets in a single year than the number of startups anyone could hope to work at in a lifetime.