I really distrust most of these eBooks, as they are usually just a bunch of generic information that you could have found for free elsewhere. All these people do is just paraphrase a bunch of information, type it in a huge font, and ramble on with a bunch of meaningless filler to make the eBook look substantial. I've seen some of these where they will spend 10 pages alone telling you how to buy a domain and buy hosting and set up Wordpress, all with needless screenshots. That's elementary stuff everyone already knows how to do.
I don't want to condone stealing, but at the same time these people are shamelessly stealing other people's money to begin with. I'll just say this, if you type the name of the eBook you are thinking about purchasing into Google along with the phrase "black hat", you should have no trouble finding it for free on some Black Hat forums.