It isn't 'griefing' if someone doesn't want that dungeon and leaves. YOU just think it is because it bothers you. Griefing is repeatedly doing the same thing in order to harass. Not someone going 'ugh, I hate this one' and leaving.

Whether you like it or not, this IS a game and people are SUPPOSED to be having fun. If someone honestly just does not like a dungeon, they are free to leave. If they're the first, it's a penalty. If others go 'I didn't want to, either. Cool.' and jump as well, that's their right. No one is FORCED to run anything. Ever. There is ALREADY a penalty. If they leave, they consider it worth it. Trying to demand they run something they don't want to is wrong. Saying 'I want to punish them MORE' is also wrong. They've already posted in here that upping the punishment is only going to make the people who don't want to do it sit around and demand to be kicked, or sit around and literally do nothing while others finish it. They avoid the new 'harsh penalty' that way. Oh well.

What is in place already is fine. People are locked out for half an hour if they jump ship first on anything. There is zero need to 'punish' people any further than that in a game.