I suggest that you should get a Prison Server, because if you have Creative, skyblock, survival and elsafy, im sure that you can fit in another server xD and that would be prison. For people that don't know about prison I shall be doing a tutorial if this Prison Server will be put on this server. Prison is about ranking up by selling ores, wood etc. You get plots so you can build. I will show you a few pictures of prison on another server:
problem with this is that it would take extremely long to make a custom plugin and our priorities are other at the momment, but nice suggestion.
To be honest I've played different kind of prison server and liked them alot. I cant see any reasons why Mega couldnt have one in future. But just at the moment like bidu said, we have other plans in our mind. Good suggestion.