Here is what I'd like to test, but it would take months or years for me to get results (since my adsense page views are low). I can make it to show Adsense to one of these group of visitors:
A - visitors coming to the site from external websites (like Google, and other external links)
(OR)
B - visitors who visited at least one internal page (ie. the ads would appear ONLY when the person visited two or more internal pages).
The biggest positive for the choice B would be that visitors will not see ads when they come from a search engine (which could improve bounce rate). But negative is that they may be less interested to click on ads.
What do you think would happen in these scenarios?