The most informative question in this forum is your question. In most of the country there are a big dealer who are dealing mostly payment online while supplying their cars to the whole world. So if you have a lot of bitcoins and you can able to buy a car then you can easily deal with the dealer and also in future it is more expected that all country will start that service for buying things through bitcoins.
There's a lot of informative question here in the forum and I dont think if this was the most cause Ive read a lot. But however if you explore more you can learn more.
Bitcoin now is almost everything in the world of market transacted. Not yet all but almost. So I will not be shock if the bitcoin was used just like this kind of trading.