A home, loose esvas and decoration
One animated house and ranch per account, with esvas roaming and decoration to place. The decoration is the item: a tradeable piece in five rarities — common, rare, epic, supreme and celestial. Nothing binds to the account and nothing is consumed on use — place it, take it back, list it, whenever you want.
Scarcity, not obligation
Here is the engine, and it is scarcity, not obligation: the drop is rare, and no one is forced to sell anything. A duplicate is yours to keep or to list — the market moves because the piece is hard to get, not because the game pushes it out of your hands. "Owning them all" is a collection goal precisely because it is not a checklist.
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.