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Food for this particular site.
It contained the answer to a crossword puzzle one of the top newspapers were running, with a £100 first prize! 12,000 people didn't know the answer so they googled it, and only me and wikipedia, who referenced me, knew the answer! That tickled me pink ...
Maybe for you but certainly not for me. I just had my best April ever. Today is my best single day ever.
However, I will say this. Anyone that relies on AdSense alone to cover their costs will likely fail at some point. Diversify the income streams.
There is absolutely no control over earnings.