Would be good as I'm currently just finished levelling monk and when I was level 69 I though one level roulette would ding me. I ended up in Copperbelt and was getting 500xp per kill instead of 20,000xp per kill in higher dungeons.not sure if the bonus at the end is adjusted to compensate but didn't level and left feeling if I'd got a SB or Late HW dungeon I would have. So had to waste my other roulettes on monk when I had hoped to get a boost on my nectar job with the remaining roulettes.
However, I can also see that removing the lowers would make queues longer as I'd only use them when levelling up to the cut off (liv.30?) and a bit extra till it becomes pointless due to low cost.