I can sympathize, really I can.
I'm sure there comes a time where people are like "For the love of God, if I hear NaNoWriMo one more time, I'm going to pistol whip somebody." I know there are people who bang out a novel in November and then merrily start subbing it to actual publishing professionals in December and January. I hear that and I cringe. I feel that agents must cringe as well, when they hear about NaNoWriMo, then grit their teeth and wait for the aftermath.
As you might guess, I'm not one of those writers. Other than Suzie Townsend's query critique thing she did last month, I've yet to contact an agent with a query (I'll occasionally tweet at/with one, or comment on a blog, but that's been it so far). Sure, I've been participating in NaNoWriMo since 2007. Does it mean a single one of those novels is query-able? Not yet.
"But Jen," you ask, "doesn't that make it a waste of time?"
See, the beauty of NaNoWriMo, the magic of it, is that it's intended to be sheer madness. It's supposed to be pell-mell words on a page. Words you never have to read again, or words you can spit shin to your heart's content....after November. I've in fact discovered NaNoWriMo works best for me when it's a project I technically don't care about. When it's a project I'm not afraid of screwing up by throwing myself down its mountain.
It's a complex notion, for me. It doesn't really mean I don't care about the book. But if it's an idea that I thought was dreadfully clever, and have toyed around with and babied in my thought process....yeah, the first draft that NaNoWriMo will produce might not be what I envision for that project. Or I'll get all wound up about getting something right and choke halfway through (NaNoWriMo 2010, I'm looking at you).
I think that 2007 and 2008, my first two, were also my most complete. The novels are technically "finished", and though I've reread parts, I haven't edited, polished, nothing. Both would require severe rewrites, I daresay, but they have a story arc. 2009 was the year I wrote my Second Unfinished Steampunk Novel. 2010 I got to about 23k words and was dead in the water for three days before I started a new novel, blasted through 20k words, and ran out of time. So almost 50k total there, just not on the same novel. 2011 was Another Unfinished Steampunk novel, wherein I muddled my waters with zombies, and I won't be doing that again. 2012 I laid down the groundwork for The Wolf You Feed, the sequel to Learn to Howl.
And 2013, I have a plan, I've named my main character and changed it at least once already, and I've got a rough idea of the opening chapters.