The cheapest gamekeystores sell GTA V for around ~47$, why should people in the digital goods section be able to easily beat that price and still make a profit? There's no logical explanation, except for illegaly obtained Keys/Accounts (and maybe to gain popularity). The same is valid for all sorts of subscriptions and accounts that are being sold here(Spotify, Netflix etc.)
Be wary and have a nice weekend
Correct. If something appears to be too good to be true, it often is. I do not agree with that ~47$ indication. I saw Wakka622 is selling GTA V on Steam for $43 and on Rockstar Social Club for $36.50 (and more discounts able if you buy in bulk). See https://bitcointalksearch.org/topic/ssteam-gamesgta-v-43-steam-365-rockstar-dota2-csgo-items-for-btcwmz-771311. I don't know him, but already many (trusted) members succesfully bought the game from him.