I think it's kind of a benefit to buy them this way. If you allready have a LT to mow with (or two), buying one w/o a deck can be used as a stand-alone yard mule to pull the cart, aerate, etc. And without a deck, it's one less thing to maintain, too!
If you take the time to think about the many other uses for a lawn tractor, it will make sense to you. Not all machines are used to cut the grass.Why is it that so many used lawn tractors listed for sale have the mower decks taken off? What good is lawn tractor without a mower deck? Why do so many guys take off the mower decks to sell the tractor? Makes no sense to me.