There isn't one.
But have you ever moved into a city, and said "hey, what's going on? What's there to do this weekend?"
People transplant to Chicago and adopt the Cubs.
Ditto for California and the Giants/Dodgers/Lakers/49ers/raiders.
The Huskers are a thing in Lincoln. And if we're assuming NO ONE who's moving to Lincoln who doesn't have Nebraska ties (pretty ridiculous assumption) you would think maybe even some of them would buy tickets because hey, it's the thing to do.
So I'm not really sure what you're arguing here.
uh, no. if this were the case when i lived in phoenix then there should have been a helluva lot more cardinals and sun devils fans. they may take in a game or two but they dont buy season tickets. most of the transplants had teams they cheered for before moving and continue to do so after moving. complete irrationality to even assume increased population should mean increased ticket sales.