What about if you try and leave a game you loose XP but if half of your team leaves the game and its 4 vs 2 you can leave the game without gaining a penalty for it. Either that idea or you can leave the game without a penalty only if 50% of players leave the game first, e.g BTB has 16 players, so when 8 players leave, doesn't matter which team, anyone can leave. But I like my first idea better. If half of YOUR team leaves then only you and the rest of YOUR team can leave without penalty, the other team with above 50% of players can leave but with a penalty.