Low Level Dungeons: Speedrunning is not cool with lowbies in the party.

[Nicobo]

That's like, not even true though, no matter how much people say it. There's no clear bonus at all unless you have your daily roulette active, and if you DO have low level roulette on a non-50 class, the XP per mob is jacked up to colossal amounts. There is absolutely no reason to not full-clear if you're grinding levels, ESPECIALLY with roulette. You only get your clear bonus once per day, and you only get massively XP-infused mobs once per day; why not kill all of them?

You have answered it... bcoz those others no clear bonus and NO EXP ^^;