On the World Office page, where all the HBD worlds are listed, there should be a link to the Private World Rules page for each world (if they have rules). Much like how there is a link to each world's Blog (if they have one). This might help owners interested in joining understand what they might be getting into.
Also, in the "Private Worlds with Openings" section of the World Office page, the Commissioner column is blank. That shoudl be fixed.