A home, loose esvas and scrolls
One animated house and ranch per account, with esvas roaming and decoration to place. All decoration arrives as a Scroll: a tradeable market item in five rarities — common, rare, epic, supreme and celestial. Using the scroll binds the item to the account.
One binding per account
Here is the engine: only one binding per account, per item. If a second copy of the same scroll drops, it will not bind, and the player has to sell it. Every duplicate becomes a listing, the market never dries up, and "owning them all" becomes a collection goal.
Prestige is not money
Achievement trophies — bosses, caverns — are bound and non-tradeable; the ones that arrive as drops are tradeable. Prestige is not money. It is purely cosmetic: it touches no stat, no odds, no power economy. Visits run on an asynchronous portrait, so nobody has to be online.