UND sells more tickets to their sporting events than other any FCS team, and that is with a relatively small area population. There is only so much energy and money to go around for a limited amount of people that a)enjoy sports b) enjoy UND sports c) enjoy UND sports enough to want to go d) have the time and money to go to a UND sports game.
Marketing and winning (word of mouth/excitement for a program) is the only things a program can do. At this point, contrary to some people beliefs, I don't think UND does a bad job marketing the program. It's their job to get people to go to the games and put on a winning product so people will return. I think they do all they can given the resources.
It is what it is.
The best way to increase attendance to football games at this point is to: A) increase the amount of tailgaters and/or B) increase the conversion rate of tailgaters attending the football game.