No, the developer takes a 20% cut I believe. He has been quite upfront about that as well.
And not all cards go for 30 SIM. The less common ones go for 10000 SIM or more.
Actually, if the average price level on the market (weighted by rarity) becomes less than 800 SIM per card, then everyone is better off buying straight from the market.
And more recently, I have noticed more and more people buying off the market rather than printing cards, because the SIM-heavy cards have dropped in price recently.
But the card stacks on the market aren't deep at all, so I expect the SIM prices to rise a bit again pretty soon.
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