Vendor trashing items is worth nothing in XIV. Even nice crafted items ... the retailers in town sell for 15000% that value. If you don't get gil from hunting or dungeons then the macro economics is is trouble after a while.

Granted the one influx that no one mentions is 'new players'. They add to the server wealth (can buy but not sell on AH) Not everyone stays playing, and some may be alts even in the near future.