A for-profit outfit that arranges to auction time with celebrities to raise money for their favorite charities reports a Houston woman paid $255,000 to spend a day with former President Bill Clinton. That was Charitybuzz.com’s biggest score in 2011, with the money going to the Clinton Foundation. A backstage meeting with Oprah Winfrey brought $105,000 for the Robert F. Kennedy Center for Justice & Human Rights and a private voice or guitar lesson from Paul Simon produced $75,000 for the Children’s Health Fund).