Bollocks to that, I'll buy a frame to ride it, not to be a f**king advert for supercycles. If some idiot wants to put Zoo! stickers on it, they can - There is no way that that should change the warrantee on the frame. In fact I would imagine that is pretty illegal.
If Onza (Sorry "Zona" :D ) wanted people to keep the stickers on there, they should have done a better job of not making them look shit.
Wow, angry post.