"Butt Ugly" springs to mind. Motorcyclists want to ride a motorcycle that looks like a motorcycle, and not like something out of Star Wars.
If I want a cruiser, I'll buy a cruiser. If I want a sports bike, I'll buy a sports bike. If I want a tourer, I'll buy a tourer. If I want a scooter, I'll buy a scooter.
If I want a SciFi bike, I'll go to ToyWorld.