To expand on that:
The plug-in works by dynamically raising the maximum amount of players in the server, to basically game the quick join system. Quick join works by filling up servers that are already almost nearing capacity. So if you are at 4 max, and you have 2 players, it will see that it's 50% full and send quick joiners your way. When you hit 3, it will go up to 6, and so on and so forth until 64 players have joined the server.
It seems like the server being kind of empty is a self fulfilling prophecy at this point. People see that no one is in there, so they don't join, causing no one to be in there. We've got to get over that hump (hopefully Karkand will help).