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Our quality guidelines warn against running a site with thin or scraped content without adding substantial added value to the user. Recently, we’ve seen this behavior on many video sites, particularly in the adult industry, but also elsewhere. These sites display content provided by an affiliate program—the same content that is available across hundreds or even thousands of other sites.
If your site syndicates content that’s available elsewhere, a good question to ask is: “Does this site provide significant added benefits that would make a user want to visit this site in search results instead of the original source of the content?” If the answer is “No,” the site may frustrate searchers and violate our quality guidelines. As with any violation of our quality guidelines, we may take action, including removal from our index, in order to maintain the quality of our users’ search results.Google Warns It May Take Action Over Affiliate Sites With Thin or Scraped Content [googlewebmastercentral.blogspot.com]
running a site with thin or scraped content without adding substantial added value
---- in order to maintain the quality of our users’ search results
The value for the visitor has not necessarily anything to do with additional content added to the websites. That's a very narrow way to judge a site. At least when it comes to ecommerce. The main value to me as a visitor would be prices, level of customer service, shipping cost, and order processing time.