5 is max of charm quality. If you check the skill, it also sais at lvl can put 5 charms in one object. I know it can boost your char really quick if you use silver or golden charms. (5 on each object can boost alot).
But héy, its part of the game <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
