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:
Yesterday I earned $506.03 from Amazon. It was actually a pretty good day, higher than average. One might think the higher than normal figure came from selling some big ticket items but that wasn’t the case. The highest commission for the day was a $21.34 commission. The vast majority of the sales were books sold from my list of photography books, which we promoted on social media recently.
It's especially true now that the big media players are finally waking up to affiliate marketing (NYTime buying WireCutter and SweetHome) and BestReviews (which was already an epic product review site in it's self due to the fact they built their own 10,000 sq ft testing lab) being acquired by Tronc (owns the LA Times and half a dozen more publications).
Who is your audience? What is your target market or niche? If you're targeting a specific niche like home security then perhaps you only need to sign up to ADT and SpyBase so your products match your audience. There’s no point promoting eco-mattresses to your blog that’s focused on reviewing drones. Again, you could sign up to a network that has a few different options in your field of interest or just go straight to your favourite suppliers and see if they have an affiliate program.