I wrote an answer on Quora for "How much do content producers who are apart of "The Deck" ad network make monthly?" which also gets into some additional details: http://www.quora.com/How-much-do-content-producers-who-are-a...
(disclosure: I'm the Founder of BuySellAds who owns Carbon Ads)
FWIW, when it comes to privacy, BuySellAds (and by extension Carbon Ads) is probably one of the few companies who don't actually do anything we don't tell you about with users' browsing data. We use it for forecasting what's available to be sold - that's it.
We also wrote a handy tutorial that will help folks determine what % of visitors are using AdBlock: http://support.buysellads.com/knowledge_base/topics/how-to-f...