Also nonsense. The stadium was built almost exclusively with debt at very favorable rates. The NFL pitch has already paid for itself, anyway, but even if it weren't it's cost is <£10M/yr.
People who think if we hadn't built the sliding pitch we could have plowed £200M into the squad don't understand anything about finance and construction of capital assets. That isn't at all how anything works.
Also, in bringing up Twickenham and Wembley as NFL/concert hosts you've proved the point. Those stadiums are rarely used grounds to begin with, and one has a surface for a sport that's not fussed with the abuse an NFL match deals it. The other has months after the NFL to repair the pitch for football.
Without the sliding pitch we could not host NFL games or nearly as many other events on non-Spurs match days. The stadium can be converted from world champion boxing match fit out to a Spurs match in less than 24 hours. No other stadium in Europe can do that - that's all extra income. Income that, because the stadium is owned by Tottenham Hotspur and not ENIC, goes to the club.
The irony is people think ENIC built the stadium for multipurpose for selfish purposes when it literally adds revenue to the club. Which is why the anchor tenant bullshit is so ludicrously wide of the mark. Plenty of reasons to have the hump with ENIC/Levy, the stadium is absofuckinglutely not one.