Warren Buffett on why he buys "terrible" businesses:A shareholder asked Buffett about Berkshire's exposure to the housing market through businesses like Shaw, Acme Brick, Johns Manville, and HomeServices, and what he sees coming over the next decade.Buffett didn't sugarcoat the present:"Well, the immediate situation is it's terrible. It's been flatlined now for a long time and it affects Shaw. It affects Acme Brick. It affects Johns Manville. Affects our home services operation and there has bee