This is sort of a side topic to Geek of Age's post. I think of readers' patterns more as what do readers prefer as to when an author posts. For me, if an author posts once a week or less, I always wait until the story is finished before reading it. Why? Because the less frequently an author is posting, the more likely the story is not yet finished. And if the story is not yet finished, the more likely it is that the story will end with the dreaded "unfinished and inactive" label. I have greater trust that if an author is posting two or more time per week, the story is already finished.
Also, I won't read stories that do not have voting turned on from chapter 1 on. Why? Because I think that the author is waiting for those who dislike the story to quit reading it so that only those who like it will vote. It sort of cheats the reader out of an honest evaluation of the story.
Third, squick me without warning me in the tags and you'll lose me as a reader. The "more tags will be added as the story progresses" and "not all tags included so the story isn't spoiled" don't really justify introducing topics not tagged.
I'm sure most readers have their own reasons for steering clear of some stories. An author who truly writes for just his own benefit can ignore them; but an author who enjoys having an audience should know them and try to pay attention to them if he can.