I'm so tired of people thinking that you can just put adsense up on your site and you are suddenly making thousands, it takes work, and even harder yet it takes patients something many people don't have. $40 a day is not really that much, and its totally obtainable if you gain the knowledge of how to place ads and build traffic slowly. Looking at my site I have no more than 30 clicks coming from any one place thats because I have tons of content that was carefully worded to show up in search engines, it wasn't done in a day. If you write 2 to 3 articles a day, place your ads where people will look, and write with keywords in mind (how people will search and find your article) and you do this over a couple of years all the while building link and marketing your site you will be earning thousands of dollars a month.
It's not a dream man..it's very true. Also what do you mean we don't have any proof? and why do you think others are obligated to show you proof? You're not going to make thousands of dollars of some 2 hour site you might of created. It takes work, content, site visitors to get good results. I personally make just under $10,000 from adsense per month. Do i care if you believe me? no..am i going to show proof? no .. i dont have to proof to anyone anything..as long as the money is in my bank i'm happy.
there are NO secrets, traffic = $$$$. And yes, hundreds of people here at DP make that kind of income per month.