Because bungie was retarded and made all factions crucinle marks vs making only those who had crucible backstory (dead orbit only) require them Its apart of the fact crucible used to be faction wars and like most of the game got butchered after the lead writer left and hacktivision said nope lets push it out now before we launch cod so advanced shitfare will look better since we are stealing a -blam!-ton of your mechanics for it and dont wanna beta test them on our game. Honestly asides at vangaurd and crucible vendors factions should take either type of marks with vangaurd costing slightly more being faster to earn I mean if vangaurd and crucible reputation can be converted to faction rep wth cant they accept marks from the vangaurd whose very tower (and council the answer to) they call home hmmm? Its another glaring -blam!-up from whats left of the dev team thats left since most left or got pulled outta the trash heap destiny got made Into and more then likely put onto destiny 2 or assisting in destiny 1 dlc so it doesnt sink completely before a sequel (reboot) can be made properly without craptivision to ensure the franchise doesnt die before it begins