Many people go for link purchase to improve page rank. It is considered as black hat seo and crticized by Google. Such technique is considered as manipulation of search results and a violation of Google’s quality guidelines. These guidelines are prime focus of Google’s Penguin update. It’s interesting that there seem to be exceptions to the rule, such as a directory like Best Of The Web, which has users pay for their sites to be considered for links. Here’s a video about it from Matt Cutts from 2009 that I have taken from WebProw news: http://www.webpronews.com/the-blurry-lines-of-googles-paid-links-policy-2012-05
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