What is the point of them if you choose a faction? Needing legendary gear but having to grind out crucible marks while a pile on vanguard marks sit there tauntingly just seems odd, when both crucible and vanguard rep works toward your faction.
Unless future vendors/factions that sell gear for vanguard marks are added, they're utterly useless to me.
Edit - This is on an account that does not have vanguard or crucible rank 2, cannot buy armour from those vendors.
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Because gear is different and suited towards playstyles. Get vanguard if you want TDYK, crucible if you want LHD, FWC if you want The Crash and so on.