I've never done it so I can't speak from experience, but I think each cruise group makes their own rules. I think most just do one gift per cabin per cruise, not per night. Personally I wouldn't sign up for a per night obligation as we were so busy last cruise just with character meets, Anna's chocolate chase, and other activities. Our last cruise also had ornament, snack, and recipe exchange groups. I think people who really enjoy doing lost of FE just signed up for multiple groups.