Steve Jobs said:"If you say, well, how do you feel about Bill Gates getting rich off some of the ideas that we had ... well, you know, the goal is not to be the richest man in the cemetery. It's not my goal anyway."
Although it was said in '94, it's not Bill's goal either. Bill is trying to be the 21st Century Carnegie. Bill has said that he plans to leave, at most, 3% of his fortune to his kids (which is still pretty huge when you think about it) while the rest is used for charity in perpetuity.