The organization of the private zones is well...horrendous. It lists things from oldest to newest, as well as keeps records of 'things' that ended without a single post at all. This takes up useless space on the server and just makes the list much longer than it should be as there is no need to save those that have no posts. I suggest that the zones be organized from newest to oldest and the junk (the saved matches that do not have posts) be deleted from the server completely. I think that there should also be a search bar where you can search for a specific username (including your own) or some sort of 'My Matches' part to it.
In conjunction with this, I believe that the cost for private zones should be solely scaled to level instead of level and rank. This, in my opinion, would be a more efficient system to go by.
Edit: Silver just pointed out the me that the posts, like everywhere else on SL are deleted over time. I think that this should be negated when it comes to the private zones. I do understand that space is an issue when it comes to the servers but the point of private zones is to...well have what happened in the zone archived as well. Otherwise, there is no point in keeping the ones from earlier years as all of those are blank now. The system is very flawed.