Stadiums get filled with ticket-buying followers. They all need transportation, food, and a place to sleep, piss, and crap.
Satisfying all those 'needs' generates taxable revenue. The entrepreneurs get rich, the gov get's it's cut, and the sheep feel they 'belong' to something bigger than themselves. It's the wolves feeding on the sheep....who are generally oblivious.
It's a modern fusion of tribalism/capitalism.
Yep, just more crony capitalism. So you were cheering on the City of New London and Pfizer about 10 years ago also.