although there is a high paying keywords but it also must consider geographic area....if the ads focus to the United States maybe can get $3 - $6 for 1 click but if click from asia maybe $0.10 - $0.30 only.... my highest for 1 click is $3.30....
Mine was $12 from 83 clicks last March 2009, Now I think it is impossible to earn that amount again because I'm suffering for a very low CTR lately done everything I even changed my template and test ads spots on different location..
If you find niches and launch several websites you can make easily $20 a day. Choosing a niche is the most important, not high paying keywords. On high paying keyword there is too much competition and wont get a lot of clicks. On niche markets you can get a lot of clicks. Maybe they pay less, but as you have many more, in the end you earn more
my best earning with adsense is around $9 but it's only happen 1 day only.. until today i never get like that anyomre
uhh.. so far 0.25$.. hahah! it seems to be getting higher and higher daily, along with my hits daily.. so hopefully I can claim one of those nice ad incomes soon