This has caused confusion before, and it's happening again. We get more than one commenter who can't quickly be told apart. Please try to establish some sort of identity. If necessary, sign your posts.
If you comment as "Anonymous" there's a danger your comments will be deleted. That's not necessarily because I'm out to get you. It might simply be that I've mistaken you for someone else. Sometimes we get more than one person commenting as "Anonymous" on the same thread, and there's at least one "Anonymous" who is banned from this blog. If I mistake your comments for one of his/hers - and I can only make the judgment on the basis of style, obsessions, and the like - it will go.
Yes, Rob, I'm talking to you. Your comments are welcome, and you sometimes sign them so I can see it's you ... but if I'm not sure it's a comment by you, it can be vulnerable to purges. The same applies to everyone who uses "Anonymous". Establish some sort of identity, which obviously needn't be your real-life one, or risk losing comments.