Scavenger Utility Mastery: An Upgrade for Support Gold Generation Late Game
http://img2.wikia.nocookie.net/__cb20131125153959/leagueoflegends/images/7/73/Scavenger_mastery_s4.png current Scavenger: +1 Gold each time an ally kills a nearby lane minion.
http://img2.wikia.nocookie.net/__cb20131125153959/leagueoflegends/images/7/73/Scavenger_mastery_s4.png new Scavenger: +1 Gold each time an ally kills a nearby lane minion. If the ally that kills the minion is already at full build, you gain +5 Gold instead.
That's it. Once people start reaching full build the typically starved support gets an increased gold flow to catch up. The person at full build often destroys a wave instantly while the starved support still needs several items and can't get the CS even though nobody else needs it. http://media.giphy.com/media/n59dQcO9yaaaY/giphy.gif