I do. My rationalizations are as follows:
* My cable lock won't go through my saddle, frame, and both wheels with enough slack to lock it to the rack. They could steal one of my wheels. I've seen this counterpoint: Remove QR wheel, lock it to the rear wheel. That doesn't solve the rest of the problems, though.
* The bike is hard to ride without a front wheel, reducing the ease of removing it from the property even if they cut the cable lock. If the QR wheel was there, locked to my bike, they could be on their way in seconds.
* They can't get much money for an incomplete bike. They'd have to steal someone else's QR wheel or buy one before they could sell the bike. It's easier to just look for some other bike lock to cut.