Do DMs out there generally hold their NPCs accountable for experience cost of making magic items? It seems kind of absurd that a master craftsman of magic items would eventually have to go out and risk his life (adventure) after making a certain number, just because he had run out of some imaginary source of mystic power (experince points). The only way I can think of to justify this is that he runs out of some rare material component, but that doesn't quite do it, since he really just needs to go face some tough encounters to get experience. Also, since skills are based on experience, this means the more you practice your ability to make magic items, the slower you learn.
Matt
Matt