You're still comparing apples to oranges, no matter how you rephrase it.  Wikipedia and the Poser forum are two different beasts, despite both being on the web.

It's kind of like looking at the statistics of last year's riots in the UK and only considering book stores.  From that, you'd conclude minimal damage and looting actually took place, whereas the reality is book stores were just about the only ones not looted and trashed.

The matter of allowing people to block certain posters from their own threads amounts to banning by stealth.  You should consider the point that if anyone really needs banning, it's up to the staff to deal with, not the forum users.

As for giving people more responsibilities, I for one don't want more responsibilities here.  I come here for fun and information; why the blue buggery should I be expected to police my own threads as well?  In any event, this place is not a democracy and nor should it be.  The remit here is completely different from Wikipedia; this is a sales and advertising driven site, like it or not.  Part of the business model includes having a forum or two, most likely for the point of generating sales.  To that end, the forums have to be as friendly and inclusive as possible, which negates any positives your idea of banning by stealth may have.

I could go on about the consequences of giving people more responsibilities in a wider context but since politics are verboten here, I won't.  :) 

Coppula eam se non posit acceptera jocularum.

My Store

My Gallery