Back when Duty Roulette was first released, Sastasha, Tam Tara, and Copperbell were by far the most common results. This makes sense because a lot of folks were using Roulette to level low-level jobs, so of course low-level dungeons are gonna crop up more often in a purely random system. SE fixed this problem by giving higher-level dungeons more "weight" whenever a group is higher level.

However, it often seems like I'm getting the SAME high-level dungeon many times in a row. I'll get Haukke Manor every day for a week, or Stone Vigil, or Totorak. It's probably all in my head, but it makes me wonder if the "fix" SE implemented is to give specific high-level dungeons weight, and switch off this weight each week. Like, this week Haukke Manor will always come up if the participating group qualifies, and next week it will be Totorak.

In order to verify, though, I'd actually have to do RESEARCH and COMMUNICATE WITH PEOPLE, which is, of course, outrageous when I'm lazy and would prefer to just post my ramblings on the forums and plants seeds for conspiracy theorists. :3