Personally, I think cars with anything over about 5 camber just look ridiculous, even 5 degrees is pushing it. It not only looks foolish but ruins the functionality and potential of the car. Also, rear end grip is hard to come by when you use CH tires, so why make your car even slower and slippier? Its just another poor way people try to be unique in this game.
Just for the record I use anywhere between 0.8-1.5 rear camber and between 2.0-3.5 front camber, with usually just a little bit of toe out on the front wheels. I try to have the rear wheels as flush to the track surface as possible while going sideways.