We left the charge capability active on both our kids cards.
DS's bill on a 7 day came to $5.......the cost of dry cleaning his tie.
DD's bill came to $ 0.
DW and I charged Tee shirts and stuff they wants on our cards, but frankly, there was NOTHING they wanted to spend money on. We cruised before free soda, but they found the Lemonade and Milk available on the beverage station then to be all they needed to drink, other than fruit punch from Topsiders.