Is blog-spam still working?

I don’t even remember the last time a spam-comment made it onto my blog. All “new-comers” get moderated automatically and every few days I clear out the spam-comments in my queue (the screenshot above shows the beginning of my moderation queue as of a few minutes ago).
Akismet is just working for me and I can tell from other blogs I visit on a regular basis, it (or some other form of comment-spam-blocking system) is working there as well.
Is it really still worth for spammers to try to clog comments on public blogs? Or are those hits just from rogue bots that have not been told to stop yet? Weird in annoying way …
Sometimes their comments pass thru the Akismet.