I've already stated it explicitly, but I'll do it again: This weblog's comment capabilities are not intended so that comment-spammers can advertise their crappy products by posting fake "comments" with a link to their commercial websites.
When I wake up in the morning and there are six such comments originating from some pathetic domain in Europe or Asia, there's not much I can do but delete them. But when the comment spam is from a U.S. company advertising some crappy bar-prep program for law students that is undoubtedly overpriced and of little utility, if any--that's where I draw the line.
What does it mean when a company with web-based, subscription-only bar-prep materials is so invisible that it must resort to placing comment spam on this weblog in order to get noticed? It means the company is comprised of a bunch of shysters and its materials are crap.
That's my working theory, anyway. If I do a little investigation and find out that it's true, I'll be sure to publish my findings in this space. In the meantime, I deleted the offending comment.