hi, i've some observations regarding adsense that i wish to share. i'm definitely no guru and i'm just posting what i have observed - maybe some of you can provide insights. in a simple test, i used adsense on 2 sites - a blog and a forum. the forum gets about 8000-10000 impressions a day while the blog gets only about 150. what i did: 1. i removed adsense from the forum for about 2 weeks 2. i put adsense back into the forum for about 2 weeks 3. i removed adsense from the forum again for about 2 weeks 4. i put adsense back into the forum again 5. all the while, adsense is used in the blog i notice that when adsense is used on both sites, the cpc rates for the blog is noticeably lower than when adsense is only used on the blog. coincidence? possibly... but i've done 2 iterations and the results are quite clear. comments?
"Noticeably lower"? How much lower? Can you give us some numbers? If not actual $ amounts, % figures would work as well. Most people would blame it on smart pricing, although I don't understand why Google would smart price an entire account since one webmaster might have many different sites on many different niches..
I thought you mentioned this, but I reread your post and you didn't. Are the blog and forum the same topic/ads?