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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Not to mention this game is in no way suffering financially. The "full game" for a year 1 player is around 130. With the player count they could probably buy their own private army. Don't even think that is an understatement.