The advantage of vanity publishing vs. letters to the editor
When you're posting on your own weblog and manage to completely mangle your post, you can fix it. But if you leave a comment that looks like it's a candidate for most incoherent post of the century, well, you're stuck with it until someone can order down an anvil delivery to the server room where the comment is kept.
(and, apropos of nothing, I appear to be the #1 giggle result for orbital anvil delivery system. Interesting, but not particularly useful when I really want to get the phone # of X industries.)