The fact that the world is not dominated by high-level mages.
They can literally do just about everything at high levels, including beating any foe (other than high-level mage), and yet, I don't see many lands truly ruled by them.
Even if a Good mage is content with simply taking a back-seat in politics to the King or whoever, how can you explain away that there wouldn't be EVIL power-hungry high-level mages that would rule their lands with an iron fist, consistenty exploring and taking over new lands, since they have so many spells to help them in their dominance.
If you argue that the mages are the ones that are REALLY in power, and the fighter (or paladin, or whatever) on the throne is just a figurehead, than that'd be fine.
But with THAT much power (and INT or CHA) centered in one corporeal being, it strains my understanding of human nature that they wouldn't take over.
Power corrupts, and absolute power corrupts absolutely, don't ya know..
