I finally put comments in moderation since the spammers wouldn't let go. How obnoxious they are. Luckily, in a way, I only have one regular commenter who I am sure won't mind the extra steps to add a comment now and then.
The problem with the spammers is not just that they have no relevance to any post, but their comment has a link to a spyware/adware site tidily enclosed so I can't let them sit. And I got tired of deleting them several times a day. Blah blah.