Warren Buffett, the renowned investor known as "The Oracle of Omaha," is a man whose advice is absolutely worth heeding. Buffett once outlined the money wasting that keeps people poor. Here are his top five. 1. Accruing Credit Card Debt Buffett is also very against credit card debt. He prefers to rely on cash instead of using a credit card. "I've got an American Express card, which I got in 1964," Buffett told Yahoo Finance.