When I was a level 32+ gla, Making my way back to town to get my job stone I queued up.
I got the that dungeon in a roulette, my gear was about the same. I personally was hoping for something lower to boost my level.
That 30-35 range anything can happen. People may have tried the level 30 quest and fell on there face and want an extra level or 2 to insure the win and the quickest way to do that is a roulette low level.