No I mean let's say I sell a stack of 64 cobblestone for 1 Billion. Obviously no one will purchase that listing.
So by default, all items on the store should have a 30 expiry timer. If the item is not sold within 30 days, it will be returned to the player in a "/collect" item panel.
This idea is meant to remove inactive listings which are sitting there longer than 30 days. For example /shop has a person seller 2 shulker shells for 10,000,000. It's been there for months. This idea will remove such items from the shop and return them to the player who listed it originally for relisting should they chose.
This idea is not for an "Auction House". It's meant to improve "/shop" and make it less cluttered.