Microsoft cofounder and Seattle Seahawks owner Paul Allen's $12.7 billion net worth makes him one of the world's wealthiest men. 16 of the NFL's 32 owners boast a new worth of $1 billion or more (perhaps 16 of 31 is more accurate, since the publicly traded Green Bay Packers have no majority owner). Stephen Ross, a real estate developer worth $3.1 billion who bought 50 percent of the Miami Dolphins from fellow billionaire H. Wayne Huizenga in 2008. Also in this group: Home Depot cofounder Arthur Blank, who bought the Atlanta Falcons in 2002. Energy industry entrepreneur Robert McNair bought up a controlling interest in the expansion Houston Texans in 1999. Source: Yahoo! Sports
