Finally decided to look -- put me down for three-ish. One banned user is on the list (mrs kippy, for those of you scoring at home).
One is on the list because the only times he post is to rattle on about his hatred of anyone who doesn't think just like him, especially Canadians (there's a hint). One of them has about 10,064 posts and every single one of them is a waste of bandwidth and occassionally a pornographic picture. One is just someone who I think is worthless as a human being.
I have removed one person from my ignore list. He was on there because his views often aggravated me during political discussions. But even though I often disagree with him politically, I find him usually interesting and insightful when the partisan blinders aren't too tight. I would often click on his posts and read them anyway, and I finally decided a while ago that as long as I stay out of political threads, he's a good guy to keep in touch with.
If I got into the political threads more, I would add a bunch more to my list on both sides of the aisle. Life's too short to go around aggravated because of someone on a frackin' message board.