I mean, I've gone to websites similar to this in the past, after seeing them mentioned on sites like Krebs, simply out of sheer curiosity (as mentioned elsewhere in the thread, a lot of my curiosity stemmed from a place of, "Hold on, this sort of site is publicly hosted and easily available to anyone!? I can't believe that"). I've never registered or posted, but some of those sites/forums are wide open for the public to peruse. I'm not even that technologically savvy or into security research, yet I've made it there, so I imagine the number is a bit higher than you'd expect.