Google claims their users click (organic) search results more often than ads, essentially rebutting the research cited above. A 2012 Google study found that 81% of ad impressions and 66% of ad clicks happen when there is no associated organic search result on the first page. Research has shown that searchers may have a bias against ads, unless the ads are relevant to the searcher's need or intent 
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Another term used interchangeably with non-organic SEO is Artificial SEO – which may or may not already tip you off as to why it is considered less appealing and thereby less effective for individuals and businesses that are trying to run a reputable website. While it often yields quicker results – a “quick fix” – in bumping up a site’s initial ranking, the effects are often not as effective in the long run in comparison to the more organic practices.