I am sorry, but this article is inane. At the time he cashed out, there were no guarantees regarding the size of the eventual liquidity event. He cashed out a portion of his stake for an assured $340 million which is more than enough to live comfortably for the rest of his life (and likely a few succeeding generations). Why does it matter that he might not have missed an "opportunity" to be a billionaire? I guess the author has never heard the phrase, "A bird in the hand is worth two in the bush."