What David R is implying is that everyone, their mothers,
and pets owns a Game Development forum, and that there just aren't enough people to go around to each and every one of them.
To back up this point, I recently shut down my own forum, due to lack of...well, any members. It was a waste of server space.
A good question to ask about your forum is, what do you offer there...that we couldn't get here? Because if it doesn't offer anything better than what's given here (a large, smart, relatively friendly user base where you can get input fairly quickly for all matter of questions), then your forum won't be too attractive to many other people.
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Formerly NWC_Omega