In case you don't know you can trade vanguard marks for it as well
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for faction gear - I dont think so friend... I used this method to rank up all 3 factions and buy all their good weapons with the crucible marks earned from selling material to the crucible quartermaster. No multiplayer required! Its weird that as soon as I ran out of weapons to buy they changed the game so that you cannot earn crucible marks any other way than in the crucible .... oh well. I think alot of people will be upset once they realise the repercussions of this. Now its only worth ranking up the factions to get a possible piece of gear at level 3 with each.