I've been burned so many times in the past with WIPs that never get finished that I tend to stay away from unfinished stories unless I get really intrigued by the premise and whether I know the author or not.
It's what happened with Horseman and I don't regret reading the story as WIP...you've been fantastic with your updates. Every day I refresh my flist hoping for the next part :) And it's actually kind of fun! *hugs*