In 2000, there were 7,000 American households worth $100 million or more; in 2003, there were 10,000; and today, though the data isn’t yet in, Boston College estimates that the number will be 14,000 or 15,000, or double what it was at the beginning of the millennium.Boston College has calculated that in 2004, the last time the Fed provided data, there were 649,000 American households worth $10 million or more, a nearly 300 percent jump since 1992.