Wait, seriously? What’s to stop me paying whatever I want/nothing at all?
Other than your strict moral code, you mean? These places usually rely on the idea that stealing from something called an “honesty bar” is a little like swiping candy from a baby. Or a basketball from Karl Malone (that dude had like a million career turnovers). That said, some hotels have honesty bars in each guest room, making it much easier to tell who's to blame if the numbers don't add up.