I think you did not get my question.
I am not concerned about the 40% impressions taken by HubPages.
I am not concerned about the 68% share already taken by Google before we all even see it.
My question is about the 60% impressions we get. For these 60% impressions, HP uses a special AdScript (not the regular AdSense ad script that we can generate from our AdSense account). This special ad script include 2 extra components:
2. Adsense Host Account Id (AdSense id of HP)
1. When Google has no Ads to show for my page, it will simply use the alternate_ad_url. In this case, HP uses a script which can do anything like showing Ads from other sources, third party ads, house Ads. I don't think we get a share of the revenue from this. Correct me if I am wrong.
2. The AdSense Host Account used in my ad script can optionally take a share out of my revenue generated out of clicks on my 60% of the impressions. My question was, does HP use this option and take any share out of it. (After a bit of research, I found out myself HP does not take a share out of this)