[@Vor]
Sanderson is one of my favourite authors. I'm particularly a fan of the way he does magic in his Stormlight Archives. It is, as I recall him describing it, a "Science based magic". I'll admit to not have read the Mistborn series, chiefly because it hasn't really peaked my interest all that much. I [i]have[/i] considered it, and might at some point, but not right now. 

But your comment makes me realise that I have insinuated that Sorcerers are both manyfold, and few. I should've been more clear as to which it were. As for a drawback or a price... I don't actually have one in mind, but I'll see if I can figure something out that will fit. My immediate thought to it is that pushing yourself too far, or attempting something too great, could cause brain damage of some kind. I've already established that Magic is something that is directed and controlled by thought, so the brain essentially. But if you bite off more than you can chew, it could lash out and damage you. I may have to rectify the "Magic fizzles if you don't do it right" thing, for that to work, as those two ideas would clash. 

So essentially, unless a person is careful, they'd end up a vegetable. 

That's just one idea, and I may have others. I'll probably update this thing in a the coming days. Thank you for the feedback :)