Hey Jay
Nothing wrong with trying to break into new ground with Google PR. I'd love to see it happen

But I just have gut feeling that the powers that be at Google have placed a ceiling for adult there. Up until lately it was 5, but lately I see a few at 6, so who knows, maybe you can break out.
At the present time Google is "THE" SE, but there have been many before that were "THE" SE. Alta Vista, Excite, etc.
My personal favorite is AOL, those people BUY from my experience, seem to get a large amount of "Looky Lou's" from Google these days.