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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If i am running striker and skullfort i ususaly end up first or second place, at moment im racking up auto rifle kills for breakneck,killing the blockers with malfeasance, doing lots of prime evil damage but because i collect very motes it looks like im the weakest link at the end of the game. The rankings at end of game should also take into account how many blockers and envoys you defeated