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Cost to lunch with Warren Buffett: $3.5 million

Berkshire Hathaway Chairman Warren Buffett wanders the company trade show before his company's annual meeting in Omaha, Nebraska April 30, 2011. Dozens of BH companies had displays in the building next to the site of the meeting.  REUTERS/Rick Wilking  (UNITED STATES - Tags: BUSINESS)

Berkshire Hathaway Chairman Warren Buffett wanders the company trade show before his company's annual meeting in Omaha, Nebraska April 30, 2011. Dozens of BH companies had displays in the building next to the site of the meeting. REUTERS/Rick Wilking (UNITED STATES - Tags: BUSINESS)  (Reuters)

The cost to dine with investor Warren Buffett has apparently spiked in value, with one deep-pocketed bidder forking over nearly $3.5 million.

The annual charity auction for a private lunch with the Nebraska billionaire closed Friday night following a flurry of activity in the final hours. In the end, the highest bid was a record-breaking $3,456,789.

The auction benefits the Glide Foundation, which helps the homeless in San Francisco. Buffett has raised more than $11.5 million for the organization in 13 past auctions.

The organization says Friday's top bidder wishes to remain anonymous. Last year's top bid was $2.6 million.

Buffett became one of the world's richest men while building Berkshire Hathaway into a conglomerate. But he says most of the questions he gets at the lunches aren't about investing.