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You know, TF2 keys are nothing about playing the game. Not many use them to open crates at all. They are used as a currency on the internet when trading, it's EXTREMELY COMMONLY used in trading, it's like money.
That's good to know, but is like giving money to a doggie instead of a snack for his good behavior, I didn't know that, but you can always train the dog to go for Coca-Cola and popcorn, and that's how a doggie should use money xd.
So, what's the market price?
EDIT: Forget I ever asked, some good guy already explained me...
Have a far cry for uPlay, looking for offers.
Please no RPG games.