On one hand, if you go 12-0, you've got a shot at going to a BCS bowl, which would be great. It would be great to know you're going to kill your opponent almost every week. However, it would be a little hard to get fired up about playing Utah State and Idaho.
I think being a consistent bowl team in the SEC is a much harder task, and I would feel more satisfaction of establishing that sort of program. Plus, it's more interesting and exciting to be playing Alabama and LSU every year than WAC teams. And knowing you have to be at the top of your game every week, or you could still get beat even by the bottom SEC team, makes the atmosphere so much more electric at each game.