Why we pay for aetherythes

I already said why we don't see NPCs at aetherytes in the 2.0 areas

Azys Lla I imagined would support the Ironworks as others have mentioned, and clearly moogles have some concept of gil since they have merchants and menders. Unless we assume that those, too, are recent innovations some sort of economy clearly exists around the Moghome aetheryte. Anyx Trine I'm not sure about other than saying that most dragon lore presents them as lovers of coin.