Warren Buffett respects his elders. During Berkshire Hathaway’s annual shareholder bash in Omaha on Saturday, the 86-year-old Oracle sang the praises of – and delivered early 88th birthday wishes to – Jack Bogle, the Vanguard founder who pioneered low-fee index mutual funds. While the sentiment is undoubtedly genuine, it is also starting to sound a bit self-serving. Buffett told the 40,000-strong live audience that Bogle had done “more for the American investor than any man in the country” by saving them tens of billions of dollars in unnecessary charges from portfolio managers. For a long while, though, Buffett offered an