This is just my mind. You can believe it or not, you can think about it or not ...
I make Internet Business and Marketing since 2004 and i have read many ebooks about making money and how to make money, how i made $xxx in xx days or months.
The most ebooks for making money with websites, adsense, cpa or other stuff are mostly the same. There are just other authors and different ways and descriptions, but they are all the same.
The ebooks brings money to the authors and the readers are as clever as before reading the ebook. You can get many ideas from reading the books but if you use step by step instructions be sure, there are many others they will do exactly like that.
I make money in different ways but there is no way that makes to a millinaire :-) If you can get some free ebooks about making money, get them, read them and think about the content. Find your own way; think about your skills, your time and find solutions to make money in your own way. The making money ebooks are not bad! But dont use step by step instructions and dont think you can as successful like the author. The author gives you not the solution for his success.
Some ebooks are very great to read and you can get many ideas - just be creative. Then you will have success in making money online.