As of patch 7.17, the Ancient Coin line of support items is the one giving the largest amount of gold. The way supports get this gold is also a very easy way. While other supports need to last hit a minion or poke, both situations that encourage the support to move or have an objective in lane the Ancient Coin gives you gold (and mana) by doing nothing besides being in the lane. Since this support item is bought mostly by Shielding and Healing supports I though maybe that would be a good way for them to gain gold. Istead of getting gold by poking the enemy they could get it by healing/shielding their allies, maybe even by destroying enemy wards or something. This would encourage them to be more agressive, so they can heal/shield their partners and gain some gold. I think this way makes Ancient Coin more healthy to the game.