Worse that that, RUDE players quit. Be considerate to the six other players in a game and fight to the finish. Should this happen, let your GM know as soon as possible, not at the last minute. It is also good etiquette to try to find a replacement yourself so that your GM doesn't have to, either by finding somebody you know to substitute or by posting a polite message to Rec. Diplomacy asking for a replacement.
Diplomacy is a very impressive game.
Some of us may have been a little too impressed, but for the most part you'll find us a harmless and good-humored bunch. Bjoern Tore Sund, Pitt Crandlemire, David Norman, Rick Desper, Simon Szykman, Manus Hand and Eric N. Coffey, who currently maintains it.