I had two AdSense ad blocks on my site and ended up replacing one of them with a Chitika banner for two weeks. Afer zero clicks, I turned of Chitika and turned AdSense back on. Seems for that particular site at least I'm having better luck with Adsense than AdBrite or Chitika. Haven't really tried any others with it yet. Maybe I'll give Chitika a try on one of my other sites, but if so I'll be adding an ad block instead of replacing one. I hate lost revenue.
Adsense especially depends on so many factors, so your eCPM can go from as little as .25$ to as high as $10+ depending on your traffic. Chitika doesn't vary as much, so it will be better than Adsense in low-pay niches, but will not even conpare to Adsens in high-pay niches. Also, sometimes having more ad Adsense units on a page will actually hurt your earning, so more isn't always better.
chitika works great only in 3 conditions ? 1. your traffic should be from a search engine "organic" 2. keyword targeted 3.and for only us/canada traffic niche's build keeping the above three points earn revenue that u can't even imagine
if you have high Search Engine.... legit Traffic then in some cases chitika even pays higher then adsense
i try clicksor, bidvertiser, and other cpm ads instead of adsense cuz my adsense account in my country is difficult to cashout.