I used a killfile back on usenet, alt.politics.whitewater, and all. Eventually I had every poster in it. Very boring.
Suit yourself- don't use it.
I had quit visiting Free Dominion, despite being one of the founders there, until they instituted an "ignore" button.
For paying members, only. Makes a nice incentive to support a board.
Now, it's the first site I go by, every morning.
For me, at least, it made all the difference in the world.
And I'm still going to bug Jim about it, every fundraiser.