I have a niche site with adsense with decent earning. So I decided to create another site with part of dmoz data. I have put adsense on the new site which has thousands of pages about two weeks ago. After that I saw consistent delay of stats and dropping of EPC of my old site's channels. (new site only makes a few dollars a day) First I didn't know what caused this and thought it was a adsense-wide delay. After I read this post
[
webmasterworld.com...] I thought my new site might be the culprit. So I dropped adsense from every page of my new site. Immediately after that, I saw my stats was uptodate and EPC coming back to what it was before I add the new site.
These may be a coincidence, but I believe not. These observations may be useful to some of you.