I do them daily 'cause I like to, for the most part.

Although, I'd be happier if they just put all current lv90 dungeons into Expert Roulette instead of separating them. When a smaller pool of roulette houses a dungeon that I'm not particularly fond of, it decrease my motivation to actually do them. Lv90 Dungeon Roulette then can be revamped to something else (i.e. All dungeon but scaled to lv90 stats, maybe?)... or removed and have those rewards redistributed between currently existing roulettes.