eBay feedback is made up of comments and ratings left by other eBay members you've bought from and sold to. These comments and ratings are valuable indicators of your reputation as a buyer or seller on eBay. They are included, along with an overall feedback score, in your Member Profile.
If you purchase items you usually receive feedback too; therefore when you become an active eBay member your feedback increases.
Check out:
http://pages.ebay.co.uk/help/feedback/about-feedback.html
/ 
