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1. Why doesn't AdSense implement in-text ads? Any ideas?Because they are crap?
2. I've been using a combination of AdSense and Infolinks for a while. A fellow webmaster recommended me Kontera instead of Infolinks. Does anyone here use Kontera? Do you perhaps know how it performs compared to Infolinks?Sorry. I only use Adsense.
3. Whichever ad provider I use, they seem to load "forever" -- meaning that they considerably slow down the loading time. Any way to prevent this?Doubtful. Have you tried them on a dedicated server?
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.
This is Jonathan from Kontera
I was using Kontera and they did well until they suddenly didn't. Support said they all of sudden did not have enough inventory for my site, even though its topic is broad and popular. Now using Infolinks and the ads are doing better than Kontera ever did.
We were very upfront about the finite nature of these campaigns and when they ended, we parted amicably with those publishers. Campaigns start and end all the time and we try to be very honest with publishers if Kontera is a good match for them.