Buffett's 90/10 Rule simply demonstrates his ignorance outside his areas of expertise which are selling insurance, buying cheap stock and PR. Clearly he has no idea how to construct a portfolio with good returns and low volatility. It also shows that he has zero trust in his successors at Berkshire Hathaway. Otherwise, why would he not allocate the 90% to BRK stock?

If everyone follows his advice it makes my job that much easier (and more rewarding.) Guess I should thank him...