The beer didn't cost me anything personally, but that doesn't make it free. If the pub advertised "our beer is free", I wouldn't be particularly impressed if I ordered one only to be told "It's only free if another customer pays for it". Would you? Are you honestly telling me that you'd consider that honest advertising?
It's exactly the same with the credits. You're saying that they're 'free' because you can get them off another player instead of buying them yourself - but the point you're missing is that another player had to pay for them! The credits are not free - they are bought, by other customers.
Or to put it more bluntly:
You walk into the pub and order a beer? That'll cost £x. You don't have to be the one to pay for it, but someone must.
You play Acheae and want X credits? That'll cost $y. You don't have to be the one to pay for them, but someone must.
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