because it wouldwork. la to vegas isbusy market.Hard to see why it would. Car rental in Las Vegas is actually pretty inexpensive, compared to rental in a lot of places. Tourists don't tend to stay in Las Vegas for the protracted period of time necessary to make it economical to haul their own cars to Vegas--whereas lots of snowbirds spend much of the winter in Florida, so it does. And, would you be suggesting that a LA-LV Autotrain commandeer equipment from the highly-profitable Florida Autotrain route?
Was there some reason you are asking this? Out of the blue, it seems, well, just silly, so please explain why you're thinking about this.