I'm really not sure...I don't really talk to anyone in the sales or advertising department. I'm assuming it has something to do with the cost of developing molds overseas (Losi's RTR kits are made in Asia) and the forseeable market they would be selling to, especially here in the states.
That's not to say that it wouldn't be a good idea. I'm more inclined to believe that a potential RTR customer would prefer, or be better off with, a truck though.