That's what CW postulated too, but I can't see a correlation between the number of votes and its score.
I was basing my opinion on the fact that ongoing serials (which remain before the public for longer periods, rather than being 'better written', by and large, typically achieving much higher scores than shorter stories. That has nothing to do with how frequently you post, after all, many of those stories post monthly, or even less often than that. You can theorize your own rationale for that phenomenon, but I see 'remaining in the public eye' as being a major objective. Posting your entire story in a week or two, by this metric, seems less productive, though I can't offer any metrics defining that belief.
The other thing I've noticed is that an initial score (based largely on the first couple chapters) often define the future scores. The scores may raise over time, but they're unlikely to change a great deal. This is evidenced by how the same story will often scored differently when posted to different sites, and the fact that each store remains largely intact over the life of the story. If you score well initially, your story is likely to be successful, while if it scores poorly (for whatever reason, a bad story being one of them), it's unlikely to suddenly shoot up to the top of the charts.
Typically, when a story finishes the people who have stuck with it will vote on the story as a whole, taking into account the ending, and the score will rise, for about a day or two. At that point, more voters will descend, those who weren't interested enough to read it while it was posting, and the score will drop (I assume, without any proof) simply because you now get more people not as committed to the basic premise voting their displeasure over the story content ('not quite what I was looking for').
Yet, the score tends to rise over time, regardless of how long it ever initially posted. So there's that to consider too.