I agree that keeping it in a case will help resale, but by the time your 2 year contract is up the phone isn't worth much, and the difference between being pristine and in fair shape honestly isn't that great. There are probably cases that are a lot less invasive, but the ones I generally see add a significant thickness to the phone, and overall make it more difficult to hold/use, especially if you put it in and out of a car dock.
so yes to each his own, but I will always have a thin cover from now on.
Sent from my frozenly delicious razr maxx.
Myth's and legends that did not exist in yesterday's world will exist in tomorrows. ~Allanon