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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If you have ever read their contract that they signed with Activision they are contractually obligated to explore microtransactions. This is the best way for them to meet said obligation.