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In Russia or Brazil it cost less, in this case Russian is region locket, but Brazilian not http://steamdb.info/sub/28187/ just install http://www.enhancedsteam.com/ to know about Russian, Brazilian or other prices. You can get Wolf Among Us for 2.5-3 tf2 keys from Russians, its not region locked.

Seems Brazilians used same method, thats why Payday 2 cost 2 tf2 keys if unpacking from 4pack :D

i dont think you will be banned. Max is that gift may be revoked. This exploit is used by only few russian traders and all of them with a high rep on steamtrades.

And it has nothing to do with 4pack bug. This region exploit is bannable. And usually when a trader gets banned, he just creates a new account for trades :D You may see a lot of traders with accounts having like 10 games but 2000 keys in backpack or 200 games at inventory. They still use their main account to play games and other stuff, but since its locked (u can use market and store) they have alt trade accounts.

What about them? A BR trader can theoretically get a copy from a RU store. Not sure if that happens often, but that could explain the low price.

Good to know. Thanks for the response.