CheesK: Came here for the witcher games. I was surprised to find that it did not sell many major titles. Not even GTA V.
GOG.com only sells DRM-free games, whether they are old, new, classic, or indie or something else. They only sell DRM-free games that they can get global distribution rights to among other factors. The big name publishers of most AAA games for the most part are not fond of the idea of selling their games DRM-free these days because they have different priorities, views on copy protection and other factors that are incompatible with GOG's policies and mission which is to promote DRM-free hassle-free consumer friendly gaming essentially.
The site has been around for many years now and grown fast in the last 7 years or so. Convincing publishers to offer their games DRM-free with global distribution and other factors is a tough sell, but they keep putting up the fight and from time to time they score a victory such as bringing on Disney/Lucasarts last year with all the Star Wars and other big name titles, some Warner Brothers games, and more recently the Darksiders and Saint's Row games and Metro Last Light Redux.
A lot has happened in the last year that we're now seeing some serious forward movement with more and more publishers becoming more comfortable with DRM-free distribution, but it is a very long road to go yet and some of the big companies are likely going to be very resistant to the idea and possibly never consider it.
So in the current time anyway you're not going to find Rockstar Games here, nor modern Ubisoft or EA games here (although there are some of their older classic titles here), nor most other big name AAA releases unfortunately, but we are starting to see more bigger name games slowly start to trickle in, and that seems to be on the rise.
So GOG's big selling point isn't having all of the best new AAA releases, but rather selling new/old/classic games they're able to secure a partnership with a publisher for in a consumer friendly DRM-free format to reduce the hassles and frustration that all the various annoying copy protection schemes cause and which most of us are totally fed up with. :) They have fantastic customer support, and they try to make all of these games new and old work on all modern operating systems as hassle-free as possible, as well as including as many bonus goodies as they can muster (artwork, videos, wallpaper, maps, soundtracks, you name it).
Of course many people here would love to see more current and new AAA titles in the store, but only DRM-free like everything else here as that's the core heart of GOG's business model and ideology, as well as that of the majority of their loyal customer base.
Hope that helps to understand GOG.com and their goals and offerings better, and hopefully we can interest you in the wonderful world of gaming without annoying copy protection garbage. :)