[roboman43]

It makes perfect sense,
wait for player to buy for street value
purpose of the shop: item that won't sell<
sell to shop for lower price
Rare items- same thing, only you can buy them back for higher than street price. You sell all the low-end items that no one will want/buy to the shop to make a small profit, or if your quitting and don't want to destroy your rares, keep them or sell it to the shop so others may buy it at a later date.