Havaco is correct -- this is where var would come in place, especially with something as fluid as MONEY. Items are designed to have single- or double-digit uses.
Note: in the future ADV-editor, you will be able to script changes to Item Uses. For example, if you want to change the number of times a Widget (ItemId of 22) as been used, you would put (in the Click script): ITEMUSED(22) = 3. If that is over the maximum, the item would tehn dissapear from the users inventory.
One "real" use i could see this having is a Health Potion bottle. You can drink from it so many times without needing to refill it. You can go to the store and refill it.