For just over two years a lot of people have been stuck on those crystal tower raids. There were a few brief periods where it was possible to get a group to do them, but if they came and went at a time you werent able to take advantage then you were still stuck. Now we have a new roulette, so these people are getting their first runs. There was a wave of LotAs, which im sure was/is/will be followed by one for Syrcus, and one for WoD. These will never reach a truly equal 1 in 6 ratio as you only need 2 cleared(or is it unlocked?) to que for roulette bonus, so WoD and Dun will always be less common(whether one of LotA + Syrcus, LotA + Ark, or Ark + Weep ever become truly popular as stopping points and thereby further upset the balance remains to be seen). So for now, im sorry but its just something to deal with. And over time, it wont even be a thing.