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One TF key is about 1.80$ value (average). I think you should make it more reasonable for people to buy it for you :)
Thing is, people value keys (and other stuff from Steam) about 25-40% less than real funds, since Money can be convered easily to Steam Wallet, but revert process isn't that simple.
1.8*2 + 0.9 = 4.5, price of BTA is 4.94$. Weeeeell xd I can't even say for sure if people will be interested in doing it for 3 keys - 5.4$ with 40 cents profit. Also, keys you buy on the market are untradable for a week.