Started in 1998, ClickBank is a go-between entity that connects vendors wishing to market their products and services, and publishers looking for relevant products to promote to their audiences. Whereas Amazon Associates is an affiliate program with a defined fee structure, ClickBank is an affiliate network that takes care of multiple vendors’ affiliate programs, so the commission structures vary. The vendors choose the commission rate, which is typically between 30 percent and 50 percent (though it can range from 1 percent to 75 percent). That’s significantly higher than Amazon rates of 1 percent to 10 percent, but of course, Amazon generates a much, much higher volume of sales.
I literally went from $20k/year to $150k/year in 2 years – see my 2018 income reports. I did this by dropping my web design/SEO clients and tried to make money with affiliate marketing (I write SEO/speed optimization tutorials). 90% of my affiliate income comes from SiteGround, a hosting company who awarded me affiliate of the month in July, 2017 when I made $9k in 1 month. Since then I have continued to hit numbers like this – the screenshot below is from March, 2018 when I made $14.5k in 1 month (just with SiteGround). I have other affiliates too.
Always disclose your affiliate relationship. Most visitors will probably understand that graphic ads will lead to your getting paid, but if you write a review or use an in-text link as a recommendation, you want your readers to know that may lead to compensation as well. This ensures you retain transparency and trust with your readers, but also, it's required by the FTC's endorsement rules.