These things aren't hand-crafted items and they have no expiry date. They're strings of data that get enabled on your account when you buy it.
This is something that makes me upset. I've seen it a lot in this thread and let me explain why:
As a fellow 2D and 3D artist, I can assure you those things are made by hand, that these are crafted by often more than one individual when the item is moved through the production pipeline. Yes you are correct that these items might be digital and can be reproduced, but everything from the concept of the item, up until the final release was indeed made by people. And is does take serious man hours to produce a new skin. May be not all eyecolors and haircolors, but everything that differs from the original character model for sure.
So please refrain from making something seem unvaluable if you don't have a clue about the effort behind it.
Are the prices still too high for the work of the models? Yes even in my opinion they are. But that doesn't mean that people should make something sound and look like it took no time and effort to make, when it is actually quite the opposite.