The money waits, and that is deliberate
A buyer's card is held at checkout and charged only once staff have checked the item. Showroom then holds the money while the item is in a locker, and the seller is paid after the buyer collects it. A seller is therefore handing something over before they have been paid, and the buyer is protected until they have it.
If the seller never drops it off, or it does not match its listing, the hold is released and the buyer is never charged. If the buyer never collects it, only the locker fee and its tax are charged.