Okay, I can understand the whole travel budget thing, but really, Going to the Superbowl, no matter where it’s played is an expense most of us would plan and save for if we could ever afford to do it at all. As for northern teams being accustomed to the cold, hell man, I bet they would be drooling at the prospect of playing in Miami or San Diego instead of some frozen north gulag.
Seriously.
Actually northern teams are built differently physically due to the climate - true of NFL teams too. There’s a reason beyond fan base for home field advantage and its rare the southern teams go north. I have known big linemen who play better in the cold then the heat and its due to build not stamina.