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..about invalid click activity come from publishers outside the US and/or from publishers of websites that cater to a world audience
my site in question receives anywhere between 700-1000 uniques a day
And there are legitimate reasons for many sites to have visitors from outside the US.
we do live in a world economy
AdSense does not really even out until you are getting 5-10K a day, at least.
If adsense is taking away 90% of your earnings, it's time to look elsewhere