Are you a forum administrator who has tried to launch several forums, and failed every time?  Is your current forum not growing?  There is one big secret to forum success: Audience

You must have an audience that you directly connect to.  You can either:

• Reach an existing audience
• Bring over an audience
• Build a new audience

It's much easier to pursue the first or second options, since you're using an existing audience.  The third option is much harder, yet that's usually the option many forums unfortunately choose since they start from scratch.