Meh, screw Steam, GOG has awesome sales all year round and their Summer Sales are bound to be amazing. Especially now that GOG will be the first DRM free online platform.
http://www.gog.com/galaxy See, that's nice and all? But Steam was responsible for 70% of all PC game sales 3 years ago. It's only gotten bigger since then, and I've seen a few 90%'s from Ubisoft/Indies recently.
Larian can't "screw Steam". GoG isn't a big deal outside of a niche of hardcore gamers. If they want to make a return on the money they put into Original Sin ( because there is no way they made the entire game off Kickstarter funds, and Sven even admitted they dipped into the Dragon Commander profits ), it needs to sell well.
And that'll only happen on Steam.
You can dislike Steam all you want, and enjoy GoG all you want, but the reality is most people only know games exist when they show up on the Steam front page. Most of my friends don't even bother checking news/reviews sites anymore, because there isn't much of a need.
If they launch during the Summer Sale, it'll kill their profits.
