[Potassium]

Of course it won't increase your player base, but it's little things like that which help to gain REGULAR players rather than a high number of players.

If people see that you're dedicated to running a good server enough to do things such as give them a place to speak to each other while in game, then they'll know that you're not just another faggot who doesn't care about their players, which will make them more inclined to come back. (assuming the server itself is good :P)