Well, the fact that the contest is about producing mass quantities of words shouldn't automatically exclude the possibility of writing something you care about, or that might turn into a quality novel later. In fact, I would say that it doesn't matter at all; nothing, NOTHING is ever good the first time you write it on the page. This fact is what makes writing so hard to start. You're destined to write crap, and if you can't bring yourself to write crap then nothing gets written, not much, anyway, or it takes a really, really long time. Works only become readable after editing, and if you have large quantities of crap but a core idea you care about, editing becomes easier because culling, rewriting, and restructuring a work is easier than adding on or starting a new.
The contest is less about "writing lots of crap and saying to yourself you can do that much" and more, as I see it, writing lots of crap for you to turn into something more later. That's why there's a followup in... March? The editing month.