Tickets sell for around $130 on average, compared to $86 in the U.S., and with more than 80,000 seats, Wembley is 25 percent bigger than most NFL stadiums. Last year, gate revenue averaged more than $10 million. For the Jaguars, who have a multi-year deal to play in London, the Wembley games are far more lucrative than their own games in Florida, where they average 61,000 fans at much lower ticket prices.
Still, the games are very expensive to stage. Each team travels with around 180 people including players, coaches, trainers and other personnel who all need to be flown over, lodged and fed. Add the league's technical staff, cheerleaders and more, and the NFL is paying for first-class travel for nearly 500 people.
The league also pays to rent Wembley Arena and training facilities for each team for the duration of their stays. It also covers the cost of promotion and events that go on for days -- costs that would, in the U.S., be born by the local franchise.
The costs are only going up, at least in the short term. Last year the league signed a 10-year partnership with the Premier League's Tottenham, pledging to play a minimum of two games per year at its new stadium, which is slated to open in 2018, plus at least two at Wembley through 2020.
And the league is openly considering basing a team permanently in London, if it can figure out the financial model and a punishing travel schedule that could upset the parity the NFL works so hard to achieve. Expensive as it is, London is still one of the five most successful host cities including U.S. markets, according to the league.
"If you are in one of the top five markets it's a pretty good bet that the core of the proposition is sound," Waller said.