I don't have very many unlocked yet, only about 5 I think, but I almost always have gotten Ifrit since unlocking this Roulette. I'd say out of about a couple dozen times or so (if not more) I have gotten Cape Westwind a few times and only once gotten The Howling Eye (Hard) as well as only once gotten Battle on the Big Bridge. I have yet to be sent to Urth's Fount, Ultima's Bane, The Navel (Hard), or Thornmarch (Hard). Nope, just keep getting Ifrit each day (I do the Roulette once a day for the daily bonus).
Is it just RNGeebus up to his usual shenanigans or is The Bowl of Embers (Hard) set on a high rate of selection? You'd think it would try to send me to any of those other places more often if it wasn't...