Does Google give a slight (or not so slight) boost in ranking to pages that have adsense on them?
From a business stand point it would make sense, they don't want to do paid inclusion in the serps but if the top serps have adsense then Google could generate revenue.
Looking at search results for a product in one of our niches turns up the following:
1. wiki-encyclopedia (no adsense)
2. a site about stuff (made for adsense)
3. article site (made for adsense)
4. competitor site (this is the first site in the serps that actually has the product available directly) (has adsense)
5. information site (no adsense)
6. a site about How to do stuff (made for adsense)
7. information site (made for adsense)
8. competitors site (no adsense)
9. another wiki site (adsense)
10. a site about answers (adsense)
Of the first 10 serps, 7 have adsense on them. I'm sure that there's a thousand different reasons for why these sites rank where they do. I just find it interesting that there are so many sites with adsense in the top results. I also think that its funny that the highest ranking competitor (a site that actually offers the product directly) is the only competitor that has adsense on their page.
Thoughts?