And that is one of the best things about American sports ...
The downside is that the teams have a monopoly in a market. You can't start a new club in their market. For example, there are 10 million people in the Toronto area. In the NHL, Toronto Maple Leafs have kept out teams in their exclusionary zone while delivering poor performance on purpose. They were compensated when the Buffalo Sabres came into the league and they have prevented teams from relocating to satellite cities of Toronto that could support a team easily. But there are teams in such hockey hotbeds as North Carolina, Nashville, Tampa, Phoenix and Las Vegas. Why? Corporate boxes and corporate season tickets that business writes off their taxes.
The Oakland As are moving to Sacramento. Why? Corp headquarter money. And they are a storied team who have won so many titles including the 3 World Series in a row 72-74 before they were pillaged by the Yankees when feee agency started. (the Ajax of baseball) Hell there is a recent huge movie about them, "Moneyball." Now they have lost all their sports teams in Oakland. Business is business....
I'd hate if football went in the direction of US sports.