Or not scoring stories is odd to me, I wonder why a person fails to score a story; good, bad, or otherwise, scores are craved by most who write on these sites.
So, my reason for not voting? I don't feel that I can give a reasonable score... Maybe I dislike the subject of the story? Though usually that is taken care of when I read, either the blurb or the tags. If a story is not tagged in a way that I find compelling it rarely gets opened. Of course I often start stories without finishing reading them, so those are stories I don't score... A putative zero, if you will, but zeros are not allowed in the scoring system.
Yet that is what I assume when a story I post fails to elicit feedback or scores...