So we shouldn't allow them. Just that simple.
For those who don't know, a pure is a player who only focuses on training certain areas of their character, generally one or two combat skills. A skill pure is less common, but they generally focus on making money. To me, a pure is a way of bending the game to their will, and I hate that. They are also quite arrogant in general, believing that just because they are a lower level and can rarely hit like a higher lvl, that makes them a better, more "clever", player.
So no matter what our players will say, and how they will act about it, we simply shouldn't allow pures in our game.
Now then, anyone perhaps have any ideas for how this could be done?