Well, for the majority of buyers here -- who just use them as a commuter vehicle -- 2WD makes sense to them as it doesn't snow, it rarely rains, etc.
But too me, it still doesn't make sense. The 4WD handles much better on slick roads whenever it does rain, plus if I want to go up north (less than 2 hours away) during the winter you can run into snow... and LOTS of it.
Plus if you want to explore any of AZ's backcountry you need 4WD.
I don't really off-road my Commander but have still found the 4WD useful for the snow up in Flagstaff.
I don't think I would ever buy a 2WD drive Jeep unless it was like an old mail Jeep or something.
You get down to the Phoenix area a lot?