JolinIres: I was kinda surprised as well since on steam
http://store.steampowered.com/app/233370/ they have a Digital Deluxe Edition that has Soundtrack, Story book,, “Making of” booklet, Papercraft mask of The Raven (printable), Digital poster (printable) for $5. I don't understand why GoG didn't get that version.
FrodoBaggins: That link shows the deluxe version on steam as £25, and the standard version on steam at £21. Much more expensive than GOG's version.
The point was that people (like me) are willing to buy a more expensive version if that's what it takes to get the extras. Steam always stocks two versions, 1 standard and 1 deluxe, latter being the one with the extras. Surely GoG can give us the same option of buying the standard (without extras but costs less) or deluxe (with extras but costs more).
Also Steam has a history of gouging the European market (pricing a game $20 and £20 for eg, as if they are the same amount). GoG is far FAR fairer, as they charge you the actual amount after conversion.