Voting sites with server lists won't be effective unless you want to give vote rewards, which I'm against and hope Nostalrius never does. If you look at any server high on vote sites and go to their site, they are basically bribing players to do the votes. They give out points for doing it, which then trade for in game equipment. This is how they got their positions, and servers that don't do this don't get up the ladder. Those will instead be buried past the first 50 or 100 list page, and never seen. So you can either sell out to boost your ranking and get seen more, or struggle being an honest server.
It can't hurt to have the server listed on sites and let us vote, just don't expect it to do much.