Some people read etiquette for advise. I probably did at first, or maybe just because I'd read anything. Now I read etiquette for the humor and the human insight. And for the humor, Miss Manners is the top.
I delight in etiquette columns, because clear guidelines are always helpful and because a skilled writer can make a simple answer into art. Martin makes me laugh, and provides me with useful information. I read her books as novels.