risk is on you, and the go-no-go decision is controlled by the party with no risk from calling things off. By putting the game in Provo, that allows for the chance that, if UW was forced to play Utah instead due to their in-conference commitments, they could use their travel arrangements in Utah to play Utah instead, with BYU no worse off.
That's not being "hard to work with," that's being rational and refusing to be taken advantage of.