Difference being Heinz Field is a nice stadium in a city with lots to do. A lot of PSU fans came in on Friday, took in the Pirates game, went to the bars, did some of the tourist stuff (fountain, incline, etc).
State College is basically in the middle of nowhere with not much to see or do and Beaver Stadium is an over-sized high school stadium with bleacher seating. I already know I have tickets for the game through a business partner, but for normal fans the attraction is less for going to State College than it is for PSU fans coming to Pittsburgh.