I do agree that most people can probably get away with excusing themselves with geases (although I wouldn't rule out a hit to Honor), but I also don't think everything is just voluntary. Compare KoS: "If the quester is still armed, he is greeted by the priestess in a friendly manner, using Orlanthi rituals, and invited to a great feast. By the laws of hospitality, which he made, Orlanth must accept." I.e, accepting hospitality is also something governed by the rules of hospitality.