I thought it was only for higher seeds. They have made Tennessee travel to the West Coast before.
EDIT: I guess to explain the position better. It wouldn't make sense for a 1 or 2 seed on East Coast to travel West to play Gonzaga if they are a lower seed. They are going to do the opposite. Leaving Gonzaga in the West, unless they are playing an equivalent seed that is even closer to home, wouldn't be fair to the higher seeds.
Granted, the committee is all over the place, however. I could still see them doing something like that. I think they like upsets because it draws attention and $$$ to tournament so they, sometimes, intentionally setup interested matchups.