Have you noticed Googles updates here? Webmaster Help Center - Why should I report paid links to Google?

Old:
“Buying links in order to improve a site’s ranking is in violation of Google’s webmaster guidelines and can negatively impact a site’s ranking in search results.”

Now:
“Buying or selling links that pass PageRank is in violation of Google’s webmaster guidelines and can negatively impact a site’s ranking in search results.”

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