timppu: ... Unless they added the DRM-free version to GOG, it doesn't really tell anything about GOG. ...
Trilarion: I guess we'll never see exact sales numbers from GOG
Especially for Paradox games, which were never even released on GOG. Yet, you use them as some kind of example against GOG. "Paradox games sold poorly on some non-GOG store => GOG is in trouble".
Anyway, I guess the game publishers know the numbers best between the stores. One of the indie game developers, I don't right now recall which one, was comparing the sales between different stores (including both Steam and GOG), and mentioned in his analysis that "GOG is clearly a rising star." (not exact quote, just from my memory).
That was last year, I think. And it was a freaking indie game, something that you apparently feel sells very poorly on GOG.
EDIT: Actually it was this one, from early 2013:
http://en.wikipedia.org/wiki/GOG.com#Market_share But yes, GOG is (most probably, as we still don't have numbers) much smaller than Steam in pretty much any measurement. But insignificant?