Hey,
Yes, we used to have NS2Stats installed, especially during the beta. However, the NS2 devs decided to remove NS2Stats from the mods whitelist, which means having NS2Stats installed makes the server appear as Modified in the server browser. Unfortunately, many players hide Modified servers by default, and that would mean a lot less players in general.
I've asked several times both the NS2 dev team and the NS2Stats team to whitelist their mod, but unfortunately for now nothing has come out of it. But maybe we'll give it a try, and see if traffic is really affected by going the Modified route. We'll keep you guys posted.