I had a discussion with an admin on the zombie mod server. You need to make nominations available to everyone. I've never seen a donator nominate a map. It is a hassle getting an admin to nominate a map for you. I'd like to look at the maps available and nominate one myself. All you have to do is set the number of nominations to a very limited number and let everybody have the ability to nominate. That would help make the server better.