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?
-
I'll do you one better. Make a perk for the collector set that when motes drop from enemies the YOU killed, they are automatically applied to you, so your teammate who didn't happen to fire a single shot can't get any motes when he keeps rushing and sliding in front of you to take them away. lol