Well everybody who owns a nano has a right to have an opinion about the scratches issue. If they want to live with that great, im glad for them. I hope in a few months time they are still usable.
My point is not one of Apple trying to sell more cases, but one of bad manufacturing / poor choice of material for the outer plastic. None of my other gadgets suffer from the same problem, but most if not all have an outer transparent plastic. Sony PSP, numerous SE phones, older ipod, ibooks at work, my apple lcd screen etc etc.. All still looking good.
In fact the 20" cinema dispay suffered from a picture frame (glass and wood) falling off the wall in high winds, and hitting it knocking it over onto the screen. No damage to the transparent plastic at all.