Here is what Google have to say about Paid Links "If a site is selling links, that can affect our opinion about the value of that site or cause us to lose trust in that site". Search Engine’s goal is to provide the best search experience to the users by giving them the most relevant and accurate results. So if you sell links then it increases the ranking of those links artificially so that search engines places those links on top. But such links hurts the relevance of search results causing inaccuracies and inequities.

If you still want to sell links then you can do that for sure but it must be disclosed through a "rel=nofollow" or other techniques.

Source: Official Google Webmaster Central Blog

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