Aside from winning Powerball, the surest route to becoming a multi-millionaire in America seems to be working on Wall Street and in financial services.

A new study from WealthInsight found that financial services produced more multi-millionaires than any other industry in 2011. It measured the number of people in the United States worth $30 million or moreand found that there are more than 30,000 such ultra-high-net-worth individuals in the United States.