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I decided to give it a try just to experience it... honestly I find it fun as hell.
Started with 10 images and ran that till I had about 100,000 impressions. Dropped the low performing ones.. ran it again.
Filtered out the sites with low ctr, ran it again
Filtered out the low performing spots on those sites, ran it again.
Now its time to split test a few more things.
At the same time I have a whitelisted site campaign running with only the good performing sites.
I see what you mean about it being a constant battle to slowly get that ctr to go up and the ecpm to go down. And I see how if you do go into it... at first you are throwing money away until it is fine tuned.
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