Understand affiliate marketing. Companies create affiliate programs to help push their products. When you become a program member—which is usually free—you can make links to promote the products on your website or another site. When people buy the products through your links, you will get a piece of the profits. As a member of an affiliate network, you can choose to promote any of several thousand products. It is possible to make up to 50–75% of the profit on each sale that results from your promotion.
Article marketing — this method seeks to gain a higher ranking in search engine results by establishing the marketer as a credible source that won't use spam software. Many marketers use websites like Ezine Articles to publish articles that contain a unique "resource box," and as other bloggers and website managers republish the article (with the resource box intact), the marketer who published the original article gradually earns higher search engine rankings.
In the case of cost per mille/click, the publisher is not concerned about whether a visitor is a member of the audience that the advertiser tries to attract and is able to convert, because at this point the publisher has already earned his commission. This leaves the greater, and, in case of cost per mille, the full risk and loss (if the visitor cannot be converted) to the advertiser.
If the answer to each of these questions is a resounding yes, rather than jumping to conclusions immediately, take time to research whether or not others are out there making a sustainable affiliate income from products and content in this niche. In a sense, competition is a good thing here—it'll help you validate your idea and prove that it's worth of building a business around.