1) The horsepower on the car makes it very hairy to drive in the rain let alone the snow. :D
2) The amount of salt they dump onto the roads rusts a car VERY fast.
3) With the intake sticking up through the hood if it rains or snows, it kills the engine. Last time I took the car for a cruise in a downpoor, I used up almost twice as much fuel to keep the engine from stalling.