Careful...
Whoever buys a new car buys a new car. Once a car is titled - to anyone - it is no longer new. If you buy it from them, you're buying a used car. There will be service and warranty impacts to that.
Actually, all new cars come with transferable warranty, good for a certain amount of years or miles...whichever comes first. I've bought several used cars with factory warranty left on them...the warranty just transfers into the new buyers name.
I do believe you have a very valid point though, a whole lot of screws could get put to you by using a middle man for a purchase like this.
I think that if I were going to buy a car with BTCs (which I'm not because I have none), I would probably just go talk to a brick and mortar dealership....or just sell the BTCs first.
