“Advertise on this site” is a feature where advertisers can directly buy ads on your AdSense block. However according to the AdSense team, this feature is not performing as well as it is expected to, and therefore it will be dropped in the weeks to come. If you are using any links to direct advertisers to the customizable Onsite Advertiser Sign-up page, it will no longer work and advertisers will be directed to a default AdWords sign-up page.

According to an e-mail sent by AdSense team, it wrotes:

Unfortunately, this feature has not been performing as well as we had hoped, and in the coming weeks the feature will be retired.

We found that the Onsite Advertiser Sign-up feature was under-performing, and so we have made the decision to focus our efforts on features that we believe will drive the best results for publishers.

I’ve previously used it myself to advertise hongkiat.com on other blogs. The good thing about this feature is that advertisers can directly order their ads on any sites they stumbled upon, provided that the site uses Google AdSense. it’s surprising to know that it’s actually not performing well.