Is it typical for a site to dance around the SERPS page when getting and losing comments with high PR? My site went from page 4 to page 2, back to 4, then page 1. All because I bought some comment posts on some sites that were PR 3-6? Is it typical that g00gle saw my backlink on the main page, then by the time new comments bumped it to the second page it wasnt relevant anymore? (Since the second page of comments has no PR)