"The way I see it is that the easiest by far way to generate significant revenue from adsense, is to simply buy established websites that have been around a while and have a history of traffic. Place adsense on them if it is not already there, and away we go.
Scratch building websites or pages is not in my view the way to go.
So in summary my look on this subject is to establish a portfolio of established websites, covering just about any topic, the topic does not matter as long as it is not violating the TOS. By doing this it is perfectly possible to have a composite impression rate of 1 million impressions a day, if not a lot more than that ,and if one gets say 2% clickthrough at say even 5 cents a go, then that is a significant income with very little ongoing overhead." James