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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You shouldn't mind something people have the choice of buying without affecting people who don't. However when it officially becomes pay to win and you have the option to be a lazy asshole, then you say what you say.