= riots. You don't get throngs of emotionally swayed/influenced people in stores and supermarkets, and even the few you do can cause a disproportionate amount of chaos by not following simple instructions or etiquette. There's a magnitude of order in terms of disposition when it comes to live sports with something like football being way up there in terms of potential discord and unpredictable scenarios.
Also, herding in football has a bad history (at least in England), really bad, and I can't see governing bodies welcoming it.
Lastly, people being told they can't go to games... particularly season ticker holders... congregations outside of stadia, assured and another headache for the correct and proper marshalling of the event as a whole. You might, if you're lucky, achieve compliance amongst the lucky few selected to go in, and also the set of fans who have just seen their team win the game, but outside of that the potential pitfalls are clear and apparent, I would say.