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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Micro-transactions in paid games made GTA5 very successful, same for Borderlands 2. There is always two sides to a story. More than one way to look at things.