tuxedo - 8:26 pm on Oct 6, 2012 (gmt 0)
Thanks for the info. So I understand, low paid clicks often relate to auto-placements whereby advertisers may conduct some kind of test-marketing and media pre-selection process.
In terms of relevance, I see countless ads which don't relate to my interests or a site's contents at all. I remain sceptical about auto-placements in general and will likely continue to favor manual placements, involving careful analysis of each media outlet. With AdWords, I often have campaigns on hold simply because I cannot find enough niche sites. There is surely a wide array of suitable placements hiding in the system which are not available due to the high number of ad servings required in the manual placement tool.
Any site cluttered with too many ads often reduce their usability, so to maintain quality of content, I will not apply more than one banner on any one page of my own sites at anytime, which could make it harder to reach AdSense's manual placement tool inclusion threshold in the first place.
My mind is usually far removed from any advertising when writing. I can however see more of a love hate relationship with ads in general, not limited to AdSense.