How do you know when to give up?
leftnode: You've already done what so many others fail: complete a site and launch it. There's no reason to call it a failure. You spend what, probably $10 a month in hosting? I wouldn't close it down because it hasn't received a lot of traffic yet.However, as the other posters say, it sounds like you'll attract a bunch of 13 year olds. May want to steer the site in a more professional direction.