I was really surprised to read the piece about the rules of group riding, complete with duties of the road captain, group and sweeper. I've never actually seen Beemers in a group ride; at least around these parts we all tend to ride our own ride and meet up for food or socialization...before riding our own rides back wherever we came from.
Is this a common practice in other parts of the country? I always thought of it as a cruiser thing: slow, upright, and in formation. Not knocking it; it's just not behavior I've observed among my fellow R, F or K bike riders.