How much are Wii controllers and an OBD2-Bluetooth connection? Can they both be connected at the same time? If they are cheap enough, people might buy them and play around just for fun, otherwise cost is probably a limiting factor for most people, especially if they don't really have a goal in mind. The other limiting factor in my case is that I don't think I have an OBD2 port. Buying a new car to rectify that little issue makes it even more expensive ;D