I suspect if you ask housekeeping, you'll seldom get charged. Particularly if you just ask the mousekeepers in the hall. But since
DVC can charge you for them, its probably best to assume you will be and be grateful for the gift if the charge doesn't show up on your bill at checkout. Certainly, no one wants to be in the situation of arguing with the front desk "but this lady on the internet said I wouldn't be charged."