While I own the site and will delete comments for my own reasons, I love comments. I learn a lot from comments and so do my readers.
I moderate your comment the very first time you comment on the site. That's to make sure you are both a human being and also a human being that isn't paid to spam sites for back links with ridiculous and totally irrelevant comments ("wow. what a great site! I'm sure I will read more."). Once I figure that out, your subsequent comments will go on the site. Unless you do a legit comment first and then start the paid spam stuff ;=)
I also moderate comments that contain Internet links in the body of the comment; at that point I moderate the comment just to ensure the link is something legitimate for the conversation and not some sneaky way to put a porn site as one of the links on my site. You'd be surprised at some of the crap that tries to get pulled.
The policy is like...the Golden Rule. Go figure.
This is a site about career management for knowledge workers. Extend the conversation through your comments.