Speaking of directories...
Oddly enough, I actually do have a directory that has about five different topics that are more-or-less centered around my main subject. It is a free, dofollow directory. I don't even require a reciprocal to link in it.
But NOBODY submits to it. I mean, I actually LIKE IT when I get a spam submission (about twice a month) because otherwise, I might not get ANY submissions.
Actually, I DO get about 50 profile submissions to the directory a month from spammers (since there is no capture challenge for creating profiles). But they don't get activated unless the spammer enters a valid email address and then clicks on the link in their confirmation email, so my directory is still pretty much spam free.