not a game as in a game. i mean a VR environment to have a 3D world of a shopping centre that users can make a market stall and advertise their real world products that get delivered to real world home addresses.
second life kinda had this where people within the environment were buying things via the gui. which got delivered to there actual physical brick and mortar house.
imagine ebay/openbazaar.. but seen via a 3d rendered shopping mall. where the evening/next day after buying things from your sofa wearing vr goggles.. you hear a amazon/dhl delivery guy knock at your actual house door