Being a professional marketer, I immediately recognized the same thing... and applaud Brett for not doing it.
Brett hasn't received my check yet, but when he does I'll be glad that he isn't selling subscriptions more aggressively.
A sparkling sales letter with compelling benefits would completely change the psychographic of the subscribers.
Currently the private forum is populated by primarily "givers", whereas a community populated by those drawn in by a powerful sales letter would completely change the forum's culture.
Brett's incredibly clear vision for the development of this community along with all the countless members that have been drawn to it, is what makes WebmasterWorld such a priceless (pun intended ;)) resource.
In some things, attraction is a far more effective strategy than promotion.