While you can suggest a round for free and when you ask well in advance you can even choose a time for it, it isn't possible to rent private rounds on this server.
It has been possible on other servers in the past, however, I am not up to date on that being possible there anymore either.
We do not have a "business model" for it at the moment as far as I'm aware, nor am I aware of plans to implement this on this server.