Yeah, but that would lead newbies to thread jack other people's threads.
That seems counter-productive to me.

Now, if someone created a forum where only people under x number of posts can submit, and make that number a bit more reasonable, like 15-25, then that way, you can partially eliminate that sort of behavior, or at least confine it.

But yes, I agree having new people spam forums suck.
Some of my other forums are fighting this tooth and nail to bring an end to spamming, but there really isn't anything you can do except restrict the forums to be invite only, and that defeats the whole purpose.

BC.