Let's say that all of the karts and bikes in MKW, or any Mario Kart were real regular sized vehicles. If you had bundles of extra cash just laying around, which vehicle(s) would you buy?
I'd buy the Wario Bike. Not because it's one of the more realistic looking vehicles, but because it's just awesome. I might also buy a Magikrusier, Daytripper, and Barrel Train simply because they are some of my favorite vehicles.