Can I trade games that are in my steam inventory for gog keys? If I get a gog key, do have to activate it or can I keep that around in case I want to trade it again later?
If you have activated the codes on Steam and the game is in your library, no you can't trade it. If you have the code but haven't activated the game, obviously you can, but you must be sure that it works. The problem with Steam is that it doesn't let you just check if a code is valid without redeeming it. On GOG you can go to the redeem code page enter the code, see if it works, and then decide. If you click redeem the game is added to your library and you can't trade it. If you click cancel, you keep the code and you can trade it or redeem it later. Only be careful because some codes have an expiration date. I'm new here so if I'm making a mistake the rest can correct me. Cheers!