That would only work for those that actually pay whatever the high price those jump potions are going to be. That and from what you posted that will only be stuff up to patch 2.55.

Adjustments still need to get made to roulettes in my opinion, they should be available to everyone that has 2+ dungeons cleared in that set roulette. The main scenario still only has 2 dungeons to it so unless there is only 2 msq dungeons in the game it is missing a whole bunch.

As for mentor roulette it should be available to all mentors, I've had to 'clear' some content to keep it unlocked that I've only done once and unless I get it in the roulette don't plan on doing again. Like the last 2 sets if Alex, ran those simply to get the 'clear' because it was required to unlock the roulette but doesn't mean I know the mechanics if it all by memory.