I'm not clear on why only some characters work magic, and I'm sure someone out there knows.
Lots of powers you either completely have or not. You can take super soldier serum, have an X-gene, be exposed to cosmic radiation, be an alien or not. I don't entirely understand magic in the MU though.
I understand that to be a sorcerer you need training, but can anyone who gets that training do magic? Is it like athletics, where anyone can run, but only a small few have the inherent ability which with training allows them to run at an Olympic level? OR is there only a tiny fraction of the human population with any inherent ability at all?
I can think of a couple of examples where primarily non magical characters have worked spells. (Doug Ramsey in the last run of new mutants for example). So why isn't everyone doing it?