All three optional faction vendors, Future War Cult, New Monarchy and Dead Orbit use Crucible marks as the mark type in the Rep + Mark currency for legendary gear. As it stands, 5 out of the 7 vendors use Crucible marks. Crucible marks can only be obtained through PvP or material exchange with the Crucible Quarter Master. My suggestion to alleviate this bias toward Crucible marks and therefore PvP, is that [b]all three optional faction vendors should accept either Vanguard Marks or Crucible marks[/b]. The reputation ranks can remain the same.