It takes time, it takes promoting it. I've got google ads up, which is why a lot of guests on the forum. I'm spending $10/day on google ads. Best thing is to just tell kids in school about it and get it going.
Overtime, it'll get the popularity it deserves. Same thing happened with the360forum.com. It just dragged on and on w/ handful of active members, but over time it started to pick up with 30-40 users online at a time.
Give it time and just get others to sign up
Once I get more time to spend online, I'll work on making bumper stickers. I'm very serious about those, I'm just uber busy w/ other things.