A $255,000 contribution to the William J. Clinton Foundation to spend a day with its presidential leader provided charity-auction organizer Charitybuzz.com with its biggest bid last year, Bloomberg reports.

The donation gave Debbie McLeod, a Houston resident who heads a foundation that aids women and girls in developing countries, a day with Bill Clinton last fall as he promoted his book Back to Work.

The founder and chief executive of Charitybuzz, Coppy Holzman, said the for-profit firm put more than 5,000 luxury and celebrity experiences up for bid to benefit nonprofit groups in 2011, an increase of 25 percent from the previous year. Other top bids bought a backstage meeting with Oprah Winfrey ($105,000 for the Robert F. Kennedy Center for Justice & Human Rights) and a private voice or guitar lesson from Paul Simon ($75,000 for the Children’s Health Fund).

Holzman said time with President Clinton has particular cachet among bidders because of the opportunity for a “glimpse into the world of an ex-president that you can’t get” otherwise.