Ah but not forgetting there are those "super affiliates" out there making $250,000 or more per year - yes its true.
BUT they are NOT the ones writing ebooks - it is generally the wannabes (those who may thing they are doing well and telling you about it to sell their books- who do the writing!!
I have a few posts on by blog
PlusOne - Musings of a marketer (search the word affiliate) with what I believe is good sound advise - none of which will make you rich, but will help avoid some pitfalls.
Now here is the secret of big bucks from affiliate programs...learn how to make use of data feeds and publish on your own shopping site - that is how THEY do it. I'm not a coder - I don't know how, which is why I just make wages from affiliate programs.