TEIN, you really don't like NaNoWriMo, do you?
I don't think it works for everyone. It does work for me, though, on many different levels. First, as you mention, the discipline. I doubt I would have finished even a short story by now if I hadn't decided to try NaNo. And I didn't "win" it the first time I tried - I can't even remember what I attempted to write that time. But I know I wrote something and I probably learned a lot from it.
I never went for the quantity over quality-thing - if a story is worth my time and effort, it's worth me writing it to the best of my capabilities, regardless of what goals, limitations and rules someone set up years ago for and with people I have never and will never have anything to do with directly. Phew, what a monster of a sentence that was!
Still, NaNo is good fun. The NaNo forums are full of silliness and seriousness and supportive, awesome people. Not everyone intends to publish, even fewer intend to publish until after proper editing and rewriting. Sure, there are some who do, but most of the participants are more realistic than that.
As for writing short stories for magazines... Just like NaNo, that's not for everyone. I very rarely even read short stories. I prefer getting to know the characters properly over time, both as a reader and as a writer. I have tried (NaNo last year, incidentally) and out of the ten short stories I set out to write, I only finished two. Out of the rest, one quickly became too long with no end in sight, and the other seven... well, those ideas didn't hold even my own interest, so the less said about them, the better.
Either way. Seven days to go, and I'm slacking on the forums instead of trying to decide what to write.
(Sorry if this wasn't the abuse you were looking for!)