Maybe it was me. @JokerProductions told me about cdkeys when I got Mad Max a few years ago. I get all of my game keys there now. The last key I bought there was The Witcher 3 on GOG last month. It included the 2 DLC packs, $90 at full retail value for $26. Of course that is an exception because the game is a year old. But even brand new AAA games are heavily discounted, usually around $40 for a $60 game.
Cdkeys is highly recommended and I have had no issues with anything sketchy. It just works.