And of course I had an adorable picture of a puppy as the image. I also only targeted people over the age of 25 who live in the United States that own a dog and also “like” an animal shelter (I chose about 50 different shelters to target). And that’s how I got 25,000 followers at under 1 cent per like. Those 25,000 people can be marketed to over and over and over again with my Amazon Associates affiliate program link.
While there’s probably a part of luck, the way you present yourself also counts. I just corrected a bunch of mistakes in your comment before approving it and I can imagine if your email to Amazon looked the same, they did not take you seriously. Consider using the free version of Grammarly when you write online. That will do a lot for your credibility (and that’s coming from a non-native speaker that also makes a bunch of mistakes and has to spellcheck a lot of what he writes).
Affiliate networks offer you access to multiple (and by multiple, we mean hundreds if not thousands) of individual affiliate programs. They basically work by simplifying the signup process - instead of applying to become an affiliate for a each product you want to promote, you simply apply to join the network and instantly have access to hundreds of different affiliate offers.