My brother is a bandwagon fan. He never attended BYU, isn't active in the church and has no ties other than the fact he lives 5 miles away from LES. He will go to a couple games a year if they are worth attending but won't put too much into it otherwise.
Without bandwagon fans, I daresay the stadium would look like a Spring Game. Only the die hards attend the Spring Game and we can barely fill the West Stands for that.