Gates has no benign philanthropic efforts. It is a classical tax evasion schema, done by every other billionaire. They put billion in (no taxes), and donate $10 million (give or take) - and do that every year. Everyone who doesn't understand a thing about accounting runs around and says what a benign individual the guy probably is, but in fact the guy just evaded taxes, and instead of giving out $400 million A YEAR to tax officials he's getting away with $10 million - which is 1%.
Another words, unless he gives away $400 million a year, he'd fooled everyone.