These guys are insane, they came over to my town last year to put stunt shows out... I must say I can never, or maybe not anytime soon ride my bike with such disregard for it, the longer the wheelie, the less oil it gets, meaning it'll need a lot of mantainence... But still, they're cool.
Yeah, there's even a 14 year old kid doing it at a pro level. These people have amazing balance, control and well... guts to do those things. I wouldn't risk breaking an arm or a leg over doing a wheelie.