First Look at TechStars Historical Results Data
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We don't focus on that number, though (I had to write code to calculate it) because the big returns in startup investing often come from outliers that look very risky at first. For example, Drew Houston of Dropbox, who was a single founder when we funded the company, or Sam Altman of Loopt, who was only 19. If we focused on the ratio of successes to failures, instead of the absolute number of big wins, it would make us conservative, and only pick companies we knew would be safe bets to get follow-on funding.
I suppose that that after a certain point it doesn't matter to an early stage investor because they will have already sold their shares.
For example, if 144 companies died and success was Google, it might have been a great return for YC, but I am not sure if applicants would see it in the same way.
Every founder believes his starup will make it big if it stays alive. So he will project his vision of success in the alive column and not care how big of a return outliers get.