If it was realised during gameplay that maybe one of the sixteen endings…

http://www.rpgwatch.com/forums/showthread.php?t=11968

…could only be achieved on the insane difficulty setting then it would all fit in and make some sense. This in itself would perhaps make a competent gamer give it another try and go for max'……but you would somehow have to learn or know of this on completing the game at a lower (non-insane) difficulty setting.

…just a rambling thought.