I'd be lying if I said I could explain the pattern, but I could offer my opinion as a Stumbler. When I Stumble, I'm often feeling a little ADD and won't even l

I'd be lying if I said I could explain the pattern, but I could offer my opinion as a Stumbler. When I Stumble, I'm often feeling a little ADD and won't even let your page fully load unless it catches my eye quickly. I'll stumble through 300 or 400 links in a day and maybe even ever see 50 of them. Note that 50/400 = 1/8 and that, if we assume 1 in 5 who actually see it sign up, we get 1/40. And 5/200 = 1/40. Whether I'm typical enough for this to explain anything is unknown (though, unlikely (I assume most stumblers don't do 300-400 pages in a day, but if they similarly don't even bother with a page unless it captures their attention the same 1/8 ratio may apply)), but I imagine it at least partially explains the issue.