When you buy an expired domain you're always told too look for bad anchors, spam, etc. I understand how to look for this stuff all too well......but what no one ever tells you is what actually occurs to a site that is over optimized, spammed, etc that causes it to not pass juice properly? Clearly a site that was complete spam that simply was de-indexed and wont be re-indexed makes sense, as it cant pass juice if its not indexed. But what if the site was partially penalized from penguin or hummingbird, where its still indexed, but may be hard to rank? Since with a pbn we dont care about rankings, if I buy a PBN, it gets indexed, it has high pr authorative links flowing too it, but it has a keyword anchor at 40% when its supposed to be at 15%, what actually happens? Does an over optimized site not pass juice or something? This has always confused me. I mean the only reason we care about over-optimization is because that page wont rank in google for its targeted keyword. But for a pbn we dont care about the page ranking, we simply care about if its indexed and if its got good links pointing to it, and if it has a high PA and DA.