The largest auction site "eBay" is planning content matching advertisements

According to Reuters communications, "eBay", the biggest auction site overseas, is developing a program that displays advertisements that match the context of the site like Google Adsense. However, all advertisements coming out will link to the content of auctions on eBay.
EBay to test advertising auctions on other sites | Reuters.com

In short, it is an affiliate program, but it seems so spiritual that it will influence every corner of various sites to take over the long tail theory and further increase sales of auction.

Indeed, will long tail extend to a doctor?