Many people who work on ranking at search engines think that selling links can lower the quality of links on the web. If you want to buy or sell a link purely for visitors or traffic and not for search engines, a simple method exists to do so (the nofollow attribute). Google’s stance on selling links is pretty clear and we’re pretty accurate at spotting them, both algorithmically and manually. Sites that sell links can lose their trust in search engines.
Search engines hate this kind of paid-for popularity. Google's Webmaster guidelines ban buying links just to pump search rankings. Other search engines including Ask, MSN, and Yahoo!, which mimic Google's link-based search rankings, also discourage buying and selling links.
The reality is that most paid links are a.) obviously not objective and b.) very often irrelevant. If you are asking about those then the answer is absolutely there is a risk. We will not tolerate bogus links that add little value to the user experience and are effectively trying to game the system.
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