Some of these crotch rockets go WAY too fast and if not skilled enough to handle the speed, just waiting for an accident to happen. I've driven one once, and once was enough for me. I don't like doing wheelies 2-3" off the ground with the front wheel just shifting gears.
I did the same... 1 time and that was enough, all 15 minutes of it.
Just for sh*ts and giggles, I got on the throttle on a nice, straight, flat road. Ran up 1st through 3rd. Looked down towards the top of third and I was doing 135.
Parked it back by it's owner, got off, and said "Never again".