First off i would like to say this is one of the best Vanilla servers I have played on. Although at times the server lag can be quite difficult to deal with. If the devs wanted to make some money to help support the server they could implement a Que system and have players donate to skip the Que.
While this would give them a small advantage over non donors , players that donate still wouldn't be getting any EXP or Gold or Items for free. In addition it would keep the server lag to a manageable level and help supplement the costs of keeping the server alive and healthy. This System would still work even if the dev's decided to open another server it would just make the Que times shorter.