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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So the only way to ever complete a daily or weekly bounty requiring mote collection would be to have the full collector set? The way to fix this is for Bungie to come up with bounties that require good, intelligent play--not selfish, stupid play focused on short-sighted goals.