Every May tens of thousands of the faithful flock to Omaha, Nebraska, hometown of Berkshire Hathaway, to bask in the presence of the investment firm’s two leaders: Warren Buffett, known for his folksy genius, and Charlie Munger, for his killer zingers. But for the truly hard core, for many years a more cloistered gathering took place near Schumpeter’s current abode in Pasadena, a lush city on the edge of Los Angeles. At the Pasadena…