People seem to come and go on our server. I have noticed some non-FF regulars who keep coming back which is good. When 4-5 of us get on the server at night sometimes pubbers start to join right away and other times they don't. I don't know why. At least with the server set to 32 players there is a better chance the server will fill. I think people are afraid to join a 64 players server when there are only 6 people already on it.
The only thing I can think of to help keep people on the server is to upload a new Startup.txt file to the server with the minimum player setting at 2 (I think the default is 8). Right now every time the server restarts we need to manually change the min player setting back to 2. When set to 2 a ranked point scoring round begins with only 2 players. Otherwise if the server is empty and a few people join they are going to sit at the 'waiting for players to join' screen doing nothing which means they will leave.
If it was decided to renew the server at 32 players I'm not sure I see the benefit of having 2 servers. If we have difficulty keeping people on just one server then it seems like the other one might be empty a lot of the time.