Funny you post that, and I don't know anything about your sports, but although it's a different sport there was sh1tload of empty seats at Wembley today and all, for a cup semi final. Reason for that was the exec section probably didn't sell out as the fixture wasn't glamorous enough/is in the middle of the camera view so looks worse and also Wigan won't sell out their allocation as they are a small club. Having the semis at Wembley - worst idea of all time. Your comment 'that would never happen at...' rings true here too, would never have happened at Villa Park.
Birmingham launches national stadium bid - Telegraph
Two thirds wanted the national stadium/Wembley in Brum, a fraction of the cost of the actual Wembley (£324m to £757m).
But no, what London wants, London gets. And four years late as well

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