Unfortunately, I've started getting spam posts on my comments, rather than actual comments about how good or bad my work is. To resolve this issue, I've had to restrict who can post comments to my site. Now only people registered with Blogger/OpenID can post, rather than any random visitor. That may result in a reduction of comments on my site, but it is really frustrating to see that you received a comment, and you get excited then you read a random piece of crap that has absolutely nothing to do with your art.
Sorry to those actual posters who want to give feedback or support but don't feel they should have to sign in/register. I wish I could leave it open to all.