I've actually had posts deleted when I pointed out that a certain blog pimp, specifically pacothecat makes post after post that is nothing but a link to a blog, yet never, ever comments on posts or replies to these postings.
I copied him with this post, yet I'm quite confident that he/she will never see or notice it.
Perhaps a probation period would be in order.
It floors me that people will join up and post articles without hanging around and posting comments for a while.
Then again, I have maybe 2 threads posted and nearly 100k comments.