Because it's more practical as a vehicle. It's more aerodynamic, probably more reliable since there will probably be parts available, and you won't get weird looks from other cars on the road.
Needless to say I was not a very imaginative kid. Guess that's what happens when you're raised by a down-to-earth, jerk of a father. I wasn't even allowed to believe in Santa.
I think it's a whole lot easier to find some cheese or hot dog than parts for some weird metallic car, and if you don't care about aerodynamics it can't get you.
I'd love to be the "very Scarry" but I'm afraid I'm driving a rhino, even though i despise clowns. We cherisho the old Richard Scarry books my wife brought with. You wanna see some other cute/interesting stuff? Search for "Rien Poortvliet gnomes" - another treasure from my wife's library.
What could be better than scooter with flying broom?
Edit: Ok, I see the apple could possibly also fly with the rotating leaf and is covered in case of rain. So team apple.
