The Amazon Associates affiliate program uses a tiered commission structure to pay out to affiliates. The more you sell, the more you will earn. That’s why many affiliates will attempt to promote two different types of products – cheap and expensive. By promoting cheap products under $10, you will likely receive a lot of purchases. For example, many affiliate marketers will promote e-books that may only cost $5. Since Amazon only pays up to 8.5% commissions, you’re not going to earn much by selling a $5 e-book. However, making a lot of sales of smaller items helps to boost your sales count in the, which also boosts the amount of commission you receive. Here is the current Amazon Associates Affiliate Program commission structure:
You should also make sure you aren't competing with your own affiliates for eyeballs. Any marketing channels you're using, such as search engines, content sites or e-mail lists, should be off limits to your affiliates. Put marketing restrictions into your affiliate agreement and notify partners immediately. It's your program--you set the rules. Or, if you prefer, you can let your affiliates run the majority of your internet marketing.