I agree with naruto all the way, don't make it premium.
And think about it... If you make the server premium then only premium players can play but if it stays cracked then both cracked and premium players can play so you would get more players on, but that brings us to another issue which is popularity, we either need to go visiting other forums and advertise or we can set up more voting systems on more popular websites, but I do not have the power to do this, so koolio you make your mind up and do what you can