Tipping Etiquette: To Announce or Not to Announce?

A reader asks Miss Manners if they should announce their intention to tip extra when dining alone to make up for the lack of profit for the waitstaff. Miss Manners advises against it and suggests eating at the bar or not worrying about it. Another reader asks if it's appropriate for a guest to close the door to the guest bedroom when they are not in the room. Miss Manners believes that once occupied, a guest room is largely the guest's territory and exceptions should come with notice.