My experience with AdSense is not so good.
From a one hand, I added the AdSense blocks on FAQ/tips pages (200 web-pages) only which are not optimized for search engines. And as result, I have no large auditory (approx.500 visitors per day).
From another hand, the results are very bad. I have average $0.4 per day in total:-) So seems $10 per month is my limit for these pages.
But negative experience is good experience too:-)
PS: yesterday I got the max daily earning fromAdSense – $2.91. In past have no more than $1.7 in one day