I'm surprised it would cause scratches. The camera lense/cover is glass, the case cover is plastic. Plastic shouldn't scratch glass even if it's rubbing against the glass if there is enough room?
I really hated covering up my Mystic White and Silver cameras, but since covering the camera module, I've not thought about the camera glass being scratched or possibly damaged every time I set my phone down on a surface like any of my past phones. And loving the sort of "high-tech/machined" look too with the silver bezels popping through the Kevlar skin.