Oooooh, Glimmertrain! It is nothing short of the holy grail for short story writers of the literary nature. I dig this rag!
I just sent them my entry for a short story contest (I forget which one--the deadline was the last day of last month) and, as I paid my $12 entry fee I said in my heart, "Here, Glimmertrain. Please have my $12. I expect nothing in return." Because I doubt I'll win. But still. I can say: "I submitted to Glimmertrain. And they rejected me. I have been knighted!" Non-writers in my life think I'm insane when I say things like this because they don't know, they just don't know! I have to use some kind of sports or Corporate America analogy before these people grasp the Glimmertrain greatness. But it's that way when I talk about the Atlantic Monthly, the New Yorker, and a couple of other places, too. ...now that I wrote all that, I'm thinking I might need to hang out with some other people. Mine apparently only read ESPN Digest and US Weekly.
Why was I responding to your question? Oh, right, yes. I have no idea how many people submit for their short story contests. But I bet it's bigger than the population of New York City (smaller than China's, though) (I hope).