Your logic is because one company makes overpriced content then all companies should.
Now do YOU even logic.
An apple is an apple even if you chop it up into pieces.
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Actually, almost all companies do that. However, as I stated in another comment, value is relative to the consumer. These items are purely aesthetic, meaning if you don't want to pay $20 for them, don't...it won't change your gaming experience. Plenty of people, however, see it as reasonable.