That's not really true.
Teams like Pittsburgh and Green Bay have huge national followings. Those teams are still lower in jersey sales than teams like the Cowboys and Patriots.
https://www.nflpa.com/players/news/t...-year-end-list
Top Ten Jersey Sales for the 2015 Season:
Tom Brady, QB, New England Patriots
Peyton Manning, QB, Denver Broncos
Russell Wilson, QB, Seattle Seahawks
Aaron Rodgers, QB, Green Bay Packers
Dez Bryant, WR, Dallas Cowboys
Odell Beckham Jr., WR, New York Giants
Cam Newton, QB, Carolina Panthers
Rob Gronkowski, TE, New England Patriots
J.J. Watt, DE, Houston Texans
Jason Witten, TE, Dallas Cowboys
Furthermore, every NFL Gate is split 60/40, with the home team receiving 60% and the visiting team 40%. Franchises that charge for PSL's and have higher ticket prices doesn't necessarily equal more profit, as teams like the Giants/Jets, Cowboys, etc. all privately financed their stadiums.
What this illustrates is that outside of a few select cities, building $1.8 billion plus stadiums is completely unnecessary, as ticket revenues will never, ever approach the billions that TV contracts provide.
These stadiums are just dick measuring contests.