Fred_DM: indies? hardly comparable to games like Skyrim, Rage or Dead Island. SteamWorks is an integrated suite that includes multiplayer matchmaking, updating, etc. no way these games will ever turn up outside of Steam.
people are just adding every game on principle, which is pointless. GoG isn't going to add brand-new 2000 games.
Indeed, but very few games actually make use of Steamworks multiplayer, and the updates and DRM have nothing to do with Steamworks itself. The only Steamworks features that 90% of games make use of are the achievements and leaderboards, and these are very easily strippable from the code.
Aside from Valve's own games and most of the indie Source games, which all use Steamworks for matchmaking, there are very few triple-A games that make proper use of VAC/Steamworks. Off the top of my head, I can name the Total War games, Modern Warfare 2 and 3, Space Marine and Dead Island. There are probably more, but not more than 30 or so. Most games have superficial Steamworks support in the form of achievements and have not been designed from the ground up as Steamworks titles.
You forget that Skyrim could be run without Steam running until Bethsoft forced a patch upon us that required Steam to run each time, and RAGE's support for Steamworks was also limited to achievements (RAGE's multiplayer wasn't handled by Steamworks).
The majority of pure Steamworks games are, indeed, indie titles. In fact, Super Meat Boy was one of the most Steamworks-integrated games I knew of until they released it in the last Humble Bundle - stripped of leaderboard functionality, of course.