In my opinion, when you join a game of diplomacy, you agree to play it to the end. You don't, after playing for a while, just sit with a unnecessary draw because you got bored.
You draw in 2 cases, you are strongly blocked from winning, or you are stopping the solo. If the solo is within reach, you should strike for it. Especially if the game is PPSC and and having someone else solo provides more points for you, even less risk.
This has always been something I don't like, but I'm particularly annoyed at a particular game I'm in. If you're in that game, you know.
(
gameID=41166 ; Unrelated, just hiding my identity)