I think Lisa pretty much covered the two reasons that I can come up with:
1) Most people would rather keep the niches they market private... sometimes, internet marketers come across small but profitable niches and subniches, and it would not be too wise to reveal them to others. When I spend my money and time in research and trial and error, it is in my best interest to keep this info to myself, and not hand it over to anyone.
2) They may not reveal their sites because they may not have any. They may have decided that they wanted to make their money by selling ebooks to other internet marketers instead of implementing the info in the books they sell. They are still in internet marketing, but their niche is not cat lovers, coffee lovers, or computer geeks, etc... it's other affiliate marketers.
In my opinion, this does not represent the value of the info in the ebook, i.e. it does not necessarily mean the info in the ebook is worthless... as I mentioned, it just means that whoever is marketing it is choosing to make money by selling products to other internet marketers instead of implementing the advice in the book in other niches.
On the other hand, the info in the ebook could be worthless...
So like with any thing else, you have to be cautious. It's usually ok, though, because if the ebook is bought from a reputable source (e.g. clickbank) you always get a money-back guarantee.
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