How do I increase the value of items in game? Quantity does not seem to affect it.

Unfortunately you can’t Think of it like a chug jug, 1 chug jug item can hold 200 hp and you can only have 1 chug jug per inventory slot, what you’re doing here is just giving them “5” different Med-Mist items. You might need to give the player more slots so they can hold more Med-Mists