How much will do you lose on resale price of an iphone4 with scratches / dings compared with selling a mint one after having owned cases and skins? So far, I have two cases and am on my third skin set. (partly about choosing the right skin set for me) That all ran me around $130.00. That's a good portion of what the phone itself cost. The only thing in favor of protection, as I see it, is in the event of a smashed glass front or back, but what does that cost to replace?