You also trade the marks from the vanguard at the vanguard quartermaster. so in any case you can pick your poison. they in no way limited your options.
English
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You can now trade Marks for materials But you can no longer trade materials for marks. That does in fact limit our options. For people that don't play PvP, the materials for marks was the only way to gain crucible marks. Those marks let us buy stuff from the faction vendors. You know, the people we do missions for when we're doing patrol missions...