Considering getting into the game/key selling market after several successful account & item shops.

Wondering what prices people would actually pay for a game, compared to the market prices. Through either a game key, or gifting the game on steam.

Some different payment methods would be nice as well. (Paypal friends and family, bitcoin, etc etc)

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Actually, include all platforms.

PC, Steam, Battle net, GOG, Xbox live, PSN, gift cards, Uplay, origin

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Could an admin move this to marketplace price checks/questions?
Thanks. (Cant remember the name of any so sorry for no tag )