I think it's important to ask yourself why you *really* care... I'm not joking or being sarcastic in any way. Why is it that you MUST have a blemish-free iPhone? Is it for resale purposes? On principle (being that you paid a lot of money for it)? Try to determine why exactly you want it to be blemish-free and ask yourself if you intend to keep it this way.
Number one reason I would want a blemish free phone is for resale value.