I, too, have always looked at ClickBank as a secondary and even tertiary monetization source. But it can be a great sources of revenue. I linked one of my articles to a related product on CB, and without really doing promotion or anything unusual, I get a few sales a week. Mind you, the keyword(s) for the post aren't that huge either. So, even though the traffic not huge on that post, it still manages to get some sales.
Find an audience for your passion or hobby and you’re all set to make money online doing something you love via a niche website. That of course, is easier said than done. Creating a profitable niche website takes time and is not intended for the faint of heart. But, if you can hurdle the steep challenges and positively answer a few key questions on whether the website business idea you’re thinking about is profitable, then you can begin building it and eventually monetize through advertising, affiliates, or other relevant products.
If you're serious about making money online, start a blog. Blogging is one of the easiest and most sustainable income sources. As long as the blog is setup the right way, in the right niche, with the right content targeted at the right audience, and the offer is complementary to the content, you could make a tremendous amount of passive income from a blog.
If my piece of content is so unique and valuable around hiking backpack recommendations, that other reputable outdoor websites are willing to link to it and build the page’s authority, then I’d have a very real opportunity to rank high in organic search for these search terms (meaning, my page will come up first when someone searches for hiking backpacks).