Let me ask a question…since you know I do not use cases. This is all hypothetical of course because I doubt you are actually looking for my model of iPhone.
Anway…
Two sellers, me and someone else have the iPhone 11 Pro Max you are looking to buy (I told you it was hypothetical,
). Both of us present to you pristine iPhones, well cared for and maintained in excellent condition. You can even get that verified by Apple that the devices pass diags (or whatever verification you wish).
Again this is a hypothetical, but let's say I'm selling for $5 (I'm not, but you get the idea) but the other buyer wants $7 for theirs. You can see absolutely no difference between the two and verified proof tells you there is none. Both are absolutely equal.
But then the other seller tells you that theirs was in a case the entire time. Mine was not.
Whose phone do you buy?
Personally, for me I'd buy it from myself. It's $2 cheaper and I know it was maintained. I'd be paying extra for…what exactly?