Riding in Style
First things first, I didn't have the sound on so i'm not sure if that part is work safe but the video is fine.
I'm not opposed to stunt riding...in the proper setting, with safety gear, emergency personnel, etc. I am no way condoning, advertising for, or "giving you ideas" that riding like this is "cool".
Comments on the video: nice use of safety gear on a bunch of them huh?

I think one of the biggest reasons not to do this (besides doing myself serious bodily harm) has got to be, why would i want to totally trash my nice bike. Hell, my bike is used and already scratched and i wouldnt do this. These guys are one what appears to be brand new bikes upwards of at least $8G. Anyway, enjoy watching how NOT to ride. I'll admit it i was laughing at most of these idiots trying to be cool (when they probably hurt themselves and not others. Taking down others is when it's very uncool).