nomis5 - 6:15 am on Sep 26, 2012 (gmt 0)
The best in-text advertiser is Vibrant Media. Yesterday I made $40.57 from 1,600 visit and 2,700 page views, with Google I made $106.61, So that's almost half of my Adsense earning.
Similar proportions for me (September aside which is appalling for Vibrant). But beware of depending on Vibrant or any of the in text advertisers because in text advertising does not work on mobiles. You are therefore using an advertisement method which will provide quickly declining income.
All the in text advertisers have been aware of this for some time and no solution has been forthcoming.