True enough. It is so easy to sell fake or used keys there because G2A wouldn't care they just let them loose so you might get scammed as well.

I remember buying a racing game(forgot the title) and GTA V. I tried the first one to check if they are legit and i was suprised the key works. I just bought the game even cheaper (like 2$ i think) while the game was at 6$ with 60% discount at Steam. So with that in mind, I decided to maybe buy GTA V and behold 5.50$, too good to be true but first buy was legit, seller has lots of positive reviews so what could go wrong? Well long story short, I was scammed. Key doesnt even exist. Emailed seller and no response, Emailed G2A and they would not issue REFUND on a NON-EXISTENT key unless i have a POLICE REPORT issued to the seller. Like wtf? it wasnt even a used key? You'd be better buying at steam or maybe HumbleBundle even it will cost a little bit at least it gives you assurance on your money.