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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Very similar to to WoW microtransactions. And that has a monthly fee in addition. If people want to by those little extras, they will. Not a big deal.