Why can't we just add the spoils of our Pyxis to the treasure pool? If I luck out on a drop, then I already have priority on it because it is in my Pyxis. Allowing me to add those spoils to the pool allows me to share those items that I decide I do not want.

No need to create some huge AH-able leech system so that players can buy their way into getting all the end-game armor without actually participating in a fight.