Wondering this, all Eu3/V2/HoI expansions were as extra games you bought granting you forum icon and possibly new avatars. Why stop this at Ck2? The Old Gods is same to Ck2 what Deus Vult was to Ck1; a big expansion that really made the game even more awesome! I know that every random DLC (some of them really silly, such as granting finally access to play rulers of other religions, which IMO should have been possible in base vanilla...) is not worth creating an extra icon, but the Old Gods should belong to the expansion category, not DLC one.