The websites I am selling use automated content, such as YouTube videos and articles. Due to the nature of the content being automatically added, the content of the website is not unique. YouTube videos can be used on any websites, and the articles are from 3rd party websites.
On all of the websites I sell, you can add your own articles, so that the website becomes more unique. You can also edit or remove current automated campaigns, as well as create new automated campaigns.
Additionally I am using a my own theme on these websites, which has 100s of design options, so that the design of every website can be completely changed. Layout, width, structure, color, design, everything can be changed so that your website looks completely unique.
In short, yes the websites are duplicate when sold, but you can make the content unique, and you can make the design unique.