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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I certainly hope you don't own any Call of Duty games, the later versions of the games all have micro-transactions. Rendering you point invalid.