I wouldn't say all cosplayers fit neatly into those two categories: Amateur vs. cunt.
Like I know one girl who has judged masquerades at anime cons, went to a fashion school, and takes the craft fairly seriously, but she considers the whole thing a hobby and doesn't make a dime off any of it. She also holds a steady day job and her husband works.
I'd rather not say her name, because... well, she's not a cow.
But honestly, even she is of the opinion that a lot of the "pros" are insufferable. She used the term "cosfamous" when I broached this very subject.