Because those are worth money and it's possible to trade them so it became a currency.
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Cuz is the best currency to have, games fall in price, but keys only fall temporarily in price during big sales, so it's better have 10 keys than a game that cost 10 keys, the game will fall in price, keys won't, also you can keep them to trade for another games after or sell them with Paypal.
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My guess is, easy, fast and simple to deal with. The price for keys don't change very much, so you can look at each key like a piece of currency of around $2 each, which you can then use to buy games fairly easily. The other thing is its much safer to trade with. For example I place 4 keys in trade, you place starbound, and then we both trade worry free compared to asking someone to send you money through paypal, hoping they don't request a problem and hoping someone sends a key.
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Sorry but someone can "explain" this?
I will accept tf2 keys, csgo keys, csgo esport keys 0.5 key is 4 ref, Capsule Key or csgo name tag
Sorry but I can't understand.. I'm new and not english..
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Refined metal. You can craft it from in-game item drops.
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