Not every UND fan lives in GF however a large portion who actively follow the team do. This means a potential connecting flight for which we're talking $300-400 on top of the trip. I consider myself a die-hard fan who would love to go to a Frozen Four to watch my team but I'd be lying if that amount didn't make me hesitate.
Also, UofMN enrollment is 48,000 this year, UND is 15,000. That's 3x the amount of "fans" graduating every single year that could very likely end up on the east coast within driving distance or a cheap flight to Philly and throw on a maroon and gold because their alma mater is in the Frozen Four.
I'm one to believe UND fans are more passionate than any other team's in the country but it boils down to a numbers game with population of the TC metro and enrollment numbers when you're talking about amount of fans. However, I do believe that 1 Sioux fan= about 4 Gopher fans, we just shoot for quality