Originally Posted by
BoomShakalaka
It's not about a challenge, it's about amount of time spent, in order to maximize your sold/hour or myth/hour.
In your scenario, doing the more challenging dungeon would net me more myth/sold, but take longer then the current 8-10min BF runs that I do. And that's killing every mob in the instance for the extra gil, and a chance at the minion. Which negates the "make people kill everything" solution.
Like someone else said, if speed runs aren't your thing, don't do speed runs.