This is nice and all, but let's not start thinking that billionaires should exist just because a few of them do charity and philanthropy. The existence of billionaires and millionaires, that is, the existence of a small group of people who own vast amounts of wealth, is the cause of wealth disparity and inequality, which in turn spawns poverty for the rest of us. Yes, this billionaire is charitable, but he also shouldn't be a billionaire. No one should.