There's no justification for it. Even if I don't spend a dime myself doesn't mean it's not sick that I paid for this game and every expansion pass and still have items blocked off from me.
It doesn't matter what items your selling.
It doesn't matter how cheap they are.
You're taking advantage of people and it's wrong. It's not a debate.
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The items aren't necessary, they are not required. You don't need to buy them, and they are purely for fun. They are completely cosmetic and affect the main game in no way whatsoever.