It's not the number of rabid fans sitting inside a stadium that brings in the Big Bucks.
It's the number of coach potatoes sitting in their living room wearing their "official" jerseys and hats watching the event and the Bud Lite commercials on TV.
Pro Sports Industry Revenue Projections (Ranked by Projected Revenues, 2006, in $ mil.) Total Revenues: 2006
NFL ................. 6,524
MLB ............... 4,030
NBA ............... 3,838
NASCAR ... ... 3,423
NHL ................ 2,129

"Pro Sports Industry Revenue Projections (Ranked by Projected Revenues, 2006, in $ mil.) Total Revenues: 2006
NFL ................. 6,524
MLB ............... 4,030
NBA ............... 3,838
NASCAR ... ... 3,423
NHL ................ 2,129"
Just for comparison's sake (I'm not trying to make some smart point here), total revenue for the English Premier League 05/06 season was $2.44 billion. That's in a country with a sixth of the population of the US, so there is money in soccer.