I don't mind creating the site, or even getting it going. I just grow tired of the daily management, the fights against the damned spambots, human spammers, or people who just get off on being disruptive.
Maybe its a guy thing? I like to build and create, but when it gets into the more maternal nuturing phase, I'd just as soon give it to someone else and build a new one?
I will say this though, XF is by far the best when it comes to automating as much of the management of the unruly as possible. Its not fun, but at least the tools are there to keep it from being a total beatdown. Major props to Jaxel and XenUtils on that too.