OMAHA, Neb. (AP) — Warren Buffett has already helped raise nearly $15 million over the years for a San Francisco homeless charity, and the group hopes someone will again be willing to pay more than $2 million for a private lunch with the Omaha, Neb., investor.

There are no guarantees someone will pay that much for a private audience with the billionaire chairman and chief executive of Berkshire Hathaway.