I've been flagging spam comments for a while. I just use a few percent to move them to the bottom or possibly hide them. I hope it discourages them from this activity. I know what you mean about 'WTF' comments. I have no idea what some are trying to say. Some seem to generate a comment from whatever tags I use. I suspect these are automated. If we flag them enough then nobody has to see them.
BTW I'm only giving your post a small vote as you did so well from your self vote and others need my vote more :)