Has anyone made any money with Clickbank?

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I tried to make money with Clickbank in the past. It didn't work. I marketed mainly through search engines but also marketed other ways as well- thru blogs, traffic sites, link swaps and more. I didn't make one red cent with them. I've since learned that it is almost impossible to make money with them because of their terms such as the refund policy which means it takes longer than usual to get paid IF you even reach the minimum. Has anyone made any money with Clickbank? Did you find it difficult?