With adsense you need to go where the money is.. niches like school grants, anything health related, insurance, credit cards ect... regargless of what niches you pick you need alot of volume with adsense to make money..
I don't think Google is playing any trick on you, the price they pay per click always varies according to the daily traffic they get and also your competitors. One of the major advange of Adsense is that they have the "monopole" on the market so you can gain a lot of visibility with them as apposised to other PPC SE. Other PPC publisher: 7Search
Hi, People are making thousands of dollars from Google Adsense. It realy depends on the niche of the site, ad placement, color blending, font size etc.