Major problem here. Higher levels and 50s do a low level roulette and then become impatient and rude when your actual low level wants to do a full xp run. It's not fair for the lower level whose actual intent is to level on the dungeon to sacrifice a huge chunk of their exp just so that other people can fly through it and get their bonus and move on. It's a broken system. Something you could do is raise exp gained while in the roulette while reducing the bonus exp, so higher levels need to actually work for that extra xp.