People are thinking new stadium like SOL but it won't be just a new stadium. It will offer more than just a footy game but they could still easily sell more tickets. They could have very cheap tickets in parts of the ground, especially kids tickets and premium prices for better seats/facilities for those with the money.
The difference being is that they will also be somewhere fans can go before and after the game and spend even more money.
The club say the site will have "a new multi-use stadium, high-performance training facilities and other mixed-use real estate development including a range of entertainment options".
Googling for more info about the site, I found this article albeit about the old proposal.
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More relevant to the grand goals of Tom Wagner, Tom Brady, and Knighthead is the even earlier attempts to build an enormous stadium. Waiting on a casino licence from the government, the arena was never built.
It was in response for a 'super-casino' which would have housed over 1,250 slot machines, and came with a £217million plan from the council. The Blues chiefs, working with American gambling and resort company Las Vegas Sands, aimed to put the casino into part of a huge 59-acre complex at Wheels Oark.
There were further plans for an Olympic-size swimming pool also with foundations to host rugby and athletics tournaments as well as concerts. Chief executive at the time, Karren Brady, said: "It's not just a stadium, it's not a casino, it's much more than that, it's a village of sporting opportunities for Birmingham.
"It will help us host events in the future like the Commonwealth Games and will be so important if we are going to attract international athletes here in preparation for 2012."