I'd bet it has something to do with a law suite at one time or another or the fear of them.
I read the sport bikes are limited to 184 mph. Or some crazy MPH around that
8-10 years ago, I was filling up my P/U and I could see the kid at the next pump was confused. He couldn't figure out how to get the gas cap open on his brand new Honda 1000cc (about) sport bike. I showed him, then he was afraid he would "get gas on the tank & melt the paint". Brand new rider, brand new bike. == I say, "I bet this thing will fly." He said he just had it up pass 150 (something) MPH and it still had more to go. === I thought, when I was his age, I would have done the same thing if M/C's would have gone that fast.