Who exactly would want to go to Boise? Answer: no one. It's a small stadium in a city that isn't exactly high up on a list of must-see places and they have turf that is annoying to a lot of people.
Further, Boise is a classic no-win situation: if, say, Ohio State goes to Boise and beats the shit out of them, then everyone says, "Ohio State should have done that." However, if, for some reason, they lose, then all hell breaks loose.