I've completed two roleplays one of which actually 'finished' and wasn't just a hurried rush that makes me embarrassed to say I finished it. However yes I have indeed ended a roleplay before. While two characters didn't actually 'finish' from my knowledge the bulk of the roleplay was finished. The sequel died quickly but for all intents and purposes the roleplay ended on a rather decent end.

This roleplay was about three teams of camp half blood demi-gods all of whom were sent out. Unfortunately due to drop outs the first group and the second group (minus one person) was disbanded (read: killed off by monsters) and the third group (Led by a guy who didn't even want to go but got hand selected at the very last moment) actually managed to come back alive. They failed their quest but there was very little they could do about that. Each person got a decent end to their characters and all around it was a good time when I actually started to become the roleplayer I am today.