Herihi: Yes, I can make a million or two if I mine and smelt for a few days (and not everyone has time to do that for hours also). But I do it as needed, to pay training expenses, to cover some crazy prices on glyphs and so on. And it's monotonous enough as is. Increasing need to mine / produce stocks to pay for training will make it just too boring, and I doubt I'll be interested in it.
Is your goal to make everything harder, or to make crafting more rewarding? If to make it harder - I don't agree, it's hard enough as is. Training metallurgy takes time, refining metal isn't instant as well, don't forget about mining time / expenses. So I see no problem here whatsoever. I do agree that crafted items pricing looks strange if it's equal to pure metal pricing. But that doesn't mean metallurgy needs to be degraded to make it "even".