Let's say there is a user page which lists users with no real content. Would it be worthwhile to display or not display AdSense on such a page?
No other ads are being used so nothing else would be displayed there anyway. Therefore are the few clicks it would generate for probably low paying ads worth it? Or does the lowered CTR have any negative implications?
If the page falls within its policies, it must definitely be tagged. CTR has absolutely no relation with the revenues earned or has any negative implications. One click may earn you .03 whereas another click may earn you .50
My best bet would be to tag as much as possible and not leave even a single page untagged and within the scope of the Google policies and rules.
Who knows that one page which you are excluding could get you 15 additional clicks per day. :)
I think that's great advice Marketing Guy. I think Google also suggests at several places in their Adsense TOS that code should be placed on "content pages". They dont say not to place it anywhere else, but there is a suggestion there that content pages, rather than indexes or sub indexes/ directories may be more appropriate.
Financially, and from their own branding perspective, google would probably love to have their code on your index pages, and short term it looks good financially for you too as often the index pages are the most popular. But as marketing guy says, you get less chance to brand your own site, which means longer term repeat visits.
Already we are seeing public service ads starting to appear on pages which have mainly external links for example. I know there are other theories and possible causes of the delivery of public service ads, but for us it seems related to the amount of actual content (rather than links) on the page.