Andrew Chen links to some data from Facebook app developers on the CPM advertising rates they're making. I was surprised to see that it's a little higher than I expected, but he noted the issues with sell-thru ("fill rates") -- the % of ad inventory that gets filled with an ad vs. remaining unsold.
If your eCPM with one network is $.50 and your sell-thru (or fill) rate is 50%, then you're no better off than the network making you $.25 eCPM with 100% sell-thru.
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