Simple. Once you get the first tier active for the set the perk makes you a magnet to nearby motes, allowing the collector to not have to compete with non collectors for motes or having to run over the same motes 5times before they pickup.
Thoughts?
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Well, I made collector set (because game borked and gave me wrong helmet, so I had to match it with corresponding set). Anyway, it is hilarious, during my matches when I wore that suit (with randoms), I couldn't pick up a single freaking mote. I kid you not - as long as somewhere else was around, even behind me, my suit ignored motes and other players picked them up. Near end of the mote gathering phase I donned my usual suit and voila, picked up some motes. WTF is that? I doubt other players implemented some "lag switch" (spelling?) to freeze me out of motes. Next match same thing - if I'm wearing suit, then I can't pick up motes. I guess people really want that revolver, so Bungie should implement Ada-like reward grind., where you select what type of reward you want. "Reward for what you do" are nice, but all I got are SMGs and shotguns. I do like shooting stuff, but I just don't like pushing people for those motes.