The wealthiest people in the U.S. evidently met recently to discuss what they could do to shore up the non-profit world. (If you haven’t heard, with the economy tanking, charitable donations are down.) People like Bill & Melinda Gates, Warren Buffet, Oprah, Michael Bloomberg, Ted Turner and more. As a group, they’ve donated more than $70 billion in last 13 years. Call it $5 billion a year for sake of easy math.