Here's how we did the math for the EPL piece being posted tonight:

First, in 2007, the Mexican national team played 12 games at nine venues in the USA. They averaged 53,207 people per game. The USA also played 12 games in 2007, drawing an average of 32,754. The USA played Mexico twice, so if we drop those two games from the USA's total, the average attendance for the USA falls to 27,958. So: The Mexican national team effectively drew double what the USA did, in the United States, and it's a reasonable assumption that they grossed almost twice what the USA did as well. Mexico reportedly grosses about $3m a game, and nets about $1.5-$1.9m.  

Second: We made some assumptions for EPL games in America based on past events. For a game involving one major team (Liverpool, Arsenal, Chelsea, Man U, Tottenham, et al.) and one mid-tier team, we assumed that VIP seats would go for about $250, with the bottom ticket at $75. Your average Boston red Sox ticket is about $50, so that's not too out of whack.
 
In a 65,000 seat stadium (and there are larger ones out there) you could have about 5000 seats at $250 ($1,250,000); 25,000 at $150 ($3,750,000), 10,000 at $100 ($1,000,000) and 25,000 at $75 ($1,875,000). That's a gross of $7,875,000.  After taxes and costs, which vary, it's not too hard to see a net of $5m. Giants Stadium or the Rose Bowl could gross $9.5, and net about $7m.

This does NOT include suite costs or the secondary market, which increasingly is coming under team and venue controls. In other words: tickets that were once "scalped" for $1200 a pop might go back into the game's bottom line.

Bottom line here is that the biggest draw in U.S. soccer - Mexico games - could be easily eclipsed at the gate by one meaningful EPL game in a major venue.