You probably know that it is a point of honor with me to keep my anonymous blog comments function open.
After all, I am annoyed when I have to go through various sign-ins and also swirly-printed passwords just to make some tiny inconsequential smartass comment on a blog. My comments are of such little value that it's not really worth it. I get most annoyed when a given sign-in looks simple but ends up in some weird technical loop that won't allow me to comment anyway, which happens more often than you might think, thanks to the cross-wired perambulations of Google and Blogger and LiveJournal and so forth.
So, I'm sorry, but it's true. I'm annoyed by it, and think you are all paranoid. All of you!
Nevertheless, perhaps there are people whose blogs truly are well-read and who really do get so many irritating anonymous spammy comments that it takes a lot of time to delete them, in which case it's understandable. But for me, it's usually one or two spammy robot comments a month, if that. However. Lately, I've been getting weird dumb spam comments like [read using DUH voice] "Nice fill someone in on and this fill someone in on helped me alot in my college assignement. Thanks you as your information." That was to a post in which I complained about Mensa, and it couldn't possibly have "fill someone in" on any dang thing at all.
Sometimes these comments are obviously spam and have a link in them, but a lot of times it's just some general comment about how fantastically great that particular blog post was, which is obviously complete BS. I'm not sure what they are doing with those comments; possibly trolling for blogs that allow anonymous comments? I can't think of anything else.