I believe that the autoblogs get de-indexed once the sites are identified as not having unique content.
I think they don't earn much , it depends on the content itself.
I took my autoblogs down after they were deindexed.
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I've been reading a blackhat forum for quite a time now and there was a guy who had 200 autoblogs (all .co.cc) which were all listed in Google. Before he got de-indexed, he changed all of his blogs to Google's domain parking service and he didn't tell numbers but according to him he earned a good sum of money with it
So we might try it
Which plugin you use for autoblog?
De index google is depend from plugin..
WPMixer? WPRobot? UAW ? Feedwordpress...
I use UAW for along time and no problem with index google, i use for few my blogs (you know, my english is no good, not easy for write article so i have to use autoblog)...
My friend use feedwordpress, his adsense is good, per day can get $$. But, when he move his hosting (because he get warning from current hosting) to dedicated server. Visitor down and earning adsense down too. Then his sites is de index google (google index is zero "0").
So, i think de index google depend from plugin. CMIIW
PS = De index google is similar with Banned Google for indexed ? It's true ?