It would be cool if you could sell loot items to associated NPCs, and that would enable you to buy a new item that only lasts for a limited time. For example you sell the deflated soccer ball to one of the brothers, and you would be able to purchase a patched ball, which only lasts so long, before you need it patched again (buy another patched ball). Or you could buy a repaired drasine that needs to be 'rerepaired' (buy another repaired drasine) every so often.