I've worn the space black stainless steel for the last 4 years (series 2) not a single scratch..it was still working perfect...not sure why I upgraded..I guess I just wanted a new toy....Apple gave me $65 for it....felt like I was getting screwed...a little bit...
That is always what happens when you trade in a product. You could have got a lot more selling it. I always just sell it to a private buyer. Same goes with cars. Every time I sell a car instead of trading it in, I save myself $15-20k.