considering that Alfred Hitchcock, Chaplin, Garbo (!) never got one he's in good company. On the other hand you had someone like Harold Russell, good as he was, win while, yes, someone like TP doesn't even get a nod. Just goes to show how political (and unimportant!) the whole darned thing is, IMHO.
And yes, I believe you're right Melody, nominations are by their peers. (I always put more creadend in the NY film critics awards, to be honest.)