Correct me if I'm wrong, but don't you get a small time waster then another question if you answer incorrectly?
Basically allowing you to re-roll the question?
Never watched videos of or played past floor 20, so I have no clue.
Seeing as they already costs mesos in Reboot, even if they were able to be abused still, they would be letting an entire server get away with it.
AP/SP resets aren't used for anything other than fixing a character that is old as sin or you somehow misclicked something on.
It's already pretty low cost and an extremely situational item in the first place. I don't know that Nexon could possibly make enough off these for a change to mesos to hurt them.