Not trying to be an ass for anything, but Bungie can't have those 2 things in there at once. Unfortunately I haven't been able to get on last night because of the lizard squad and i won't have time until tonight, but from what I've heard, it's 10 marks for 20 materials. Before that, it was 50 materials for 5 marks? Not sure since I never used that. Anyway, if they kept both in, you could just play PvP for a day then spend 30 marks for 60 materials and turn those in for 5 marks or however many you got back in return.