Trilarion: it's extremely peculiar that evey big Kickstarter project started with Steam and ended up offering a DRM free version. They must see an advantage (although not from the beginning).
Yes, the advantage is marketing.
DRM free is nowadays mainly used as a marketing phrase (see also:[indie]). It's not like Obsidian wasn't aware of GOG or vice versa. So why not start of with the announcement of a DRM free version? It's not like Obsidian is a two man operation with no prior market experience.
But pulling nice little stunt like this keeps people talking about the project and gives them a new, positive place in the headlines. The timing was perfect, the initial joy and surprise for this Kickstarter was cooling down. Pledges were "saturated". At this point, the announcement of a DRM free version gave them a new little boost. As I said before, the "DRM free crowd" is loud and noisy and it is a smart move to use them for your marketing.
What GOG and Obsidian did was a stroke of genius, that is for sure.
thelovebat: I think its no surprise that'd I'd say without a doubt EA had something to do with it.
SLP2000: Really? I think EA has enough money to laugh at Kickstarter.
And I'm tired of that EA / Ubi / Activision hate. They have their sins, but they did some good job too (bringing their classics to GOG, if nothing else)
Haters gonna hate ... And a jab at EA is always good to get some crowd approval.