Penalty for pre-made parties

[Stepjam]

Its to prevent fishing, if you are a 4 man pre made and do a roulette for sample levelling, you could fish till you get a dungeon you want to do that's why your getting a penalty for leaving.

But why would that matter? They already added a function that limits you to dungeons close to the lowest level player if it's a full premade, so why would it matter if you go fishing for a dungeon?