Well, in a roundabout way, it makes sense... They're sitting on one of the largest reserves of oil in the world, but they know as well as anyone it's not renewable. It would be in their best interest to see it's rate of consumption reduced.
Come on how much enrgy does Iran use. It would be an insignificant amount of oil and as I said it would be cheaper to import either foriegn oil or nuclear fuel than to produce their own. You right its really about whether one believes they should be allowed to have nukes or not.