I second this, but for the reason that I would like to do leveling roulette and not get dungeons from level 15~30 when I'm level 65+.

Maybe 3 separate roulettes? Less than 50, Level 50~60 and Level 60~70; something like that? I like knowing the level range of what I'm getting myself into. I mean for some reason they have split Expert Roulette and Level 70 Dungeons now. So why not? Lol.

One thought comes to mind though. Perhaps the lower level roulettes would suffer from longer queue times if this roulette got split up so much.