I'm pretty dissappointed that you have to buy the game in order to buy the soundtrack. I'm not interested in the game but the music i've heard so far ist awesome.
I'd like to listen to it while studying or playing other games.
Just my 2 cents :-)
Sadly, it seems to be a general "GoG" thing that any extras such as an art book or sound track, cannot be purchased unless you have purchased the base game.
Obviouosly we can all understand why that is there for the DLC but it would indeed be nice if we could purchase sound tracks and other non DLC extras such as art books where available without buying the base game. I'm sure there are others who love some sound tracks but may not be interested in some titles.
All we can do is recommend it to GoG and hopefully it enough people request it, it could perhaps turn into reality.