No, that's not my logic. My logic is that Princess says what the daily CA fee is and therefore, they are bound by it. Drinks, wifi, etc. are in a fungible pot of money called expenses. CA is not the same. There are rules about it and what it can be spent on. It's in its own account (similar to vacation/PTO for a company). Your company can't spend the money PTO money -- it's held in something similar to escrow. And Princess can't spend the CA for similar reasons.