In his latest Letter to Shareholders of Berkshire Hathaway, Warren Buffett reveals that when he dies he has directed his financial advisors to take the money that goes to his wife and put 90% of it in Vanguard's S&P 500 index fund. As part of the coverage that accompanies the Berkshire Annual Meeting, the Omaha World Herald did a story on this and asked several local brokers for their opinion. Their response was “that’s okay for Buffett, but not for the average investor.” Their justi...