Here's the better question. Why bother queuing for Roulette EX if you just want to do Fractual or Neverreap? Just queue for the Dungeon you want. That 35 Esoterics can easily be replaced by another run of the dungeon you love to play.

I've never heard of people dropping out of these dungeons at start tho. Maybe a Datacenter thing or something cuz I never had anyone drop from either dungeon.