As a new Story Hour writer, I thought I would throw in my two cents about what I've learned from the two months or so I've been involved.
A lot of people might be reading your Story Hour that never post anything. I have maybe one or two that have posted to mine more than once, but every time I post a new scene, the views meter jumps by maybe 10 or 15. Sure, some of those are me editing the post, but I would guess that I probably have 10 readers that have never posted.
Consider why you want to create a Story Hour thread. My reason was that I really wanted to create a good superhero story, and I wanted to do it in a comic book format. I'm using a new game system (Mutants & Masterminds), and I thought people new to the system might like to see how the mechanics work, so I threw them in as well.
Try to keep your thread on the first page. I think that's key to attracting readers. And don't just do this through self-bumps. Add comments, scenes, or whatever to keep it going. I don't think I attracted any readers until I had more than 10 or 15 of my own posts to get the story going. My thread has been on the first page the whole time, though, because I keep at it, and every time someone posts, the thread goes to the top of the first page again.
My advice would be to consider what you're doing and why you're doing it, come up with something that's going to keep you interested and the reading public entertained, and keep posting to make sure you stay on the first page.
Good luck.