Just a small idea: How about adding random NPC trades. Similar to the daily quests, but permanent? 

Such as... <some faction> is looking for a Snow Leopard Gryphon for <purpose>, and are offering to trade <some item> for one.

The item rewards could range from pretty useless (5x Licenses) to occasional rare items (energy drinks and such, maybe even occasionally some of those warlock trade items). 

I think it'd reduce the number of the pets in the pound, and could vitalize the player trade market. While giving newbies a chance at getting rarer items.