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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Most games, free or $60 in price, contain "Micro-Transactions." Call of Duty Advanced Warfare had "Supply drops" Metal Gear Solid has transactions as well. You don't need to buy the stuff, but you better well thank the people who buy the "Cosmetic" items because you're getting free content because of them.