Not that I am against having to rent them, it is no big deal, I already rented my 2 for the season.
But the argument about different sizes and controversy created by trying to self install doesn't hold much weight IMO. We have carried them into Lambeau every year for about the last decade, and it is never a problem, they also rent them there on a game by game basis if you want that option. Maybe they are afraid of them becoming projectiles or something, but most likely it is about $$.
It is a bit of a pain in the a@& to carry them around for 5 hours before the games over there, so it is worth the few bucks a game not to have to haul it around.