Kindle plus Clickbank?

They are very particular about it. They have bots that go out and double check the price of your book on Amazon as it compares to other major ebook retailers. If you have a book for $5.99 on Amazon and $4.99 on Barnes and Noble, Amazon will find it and discount your book down to $4.99 automatically.

The amazon price has to match the lowest available price for that format, period.

On the other hand - I assume Amazon doesn't have the same 50% refund rate.

I would imagine with a new title and mixing up the content, you could sell it as something completely different/complimentary.

At the end of the day, everything written is something rewritten.

I think it's partly because you're more aware of ClickBank than of some other aspects of internet marketing, and therefore you notice it more. In the same way, I ask myself "why do I keep reading this nonsense about article marketing?", because - for example - I notice that very few people discussing duplicate content, article directories and so on understand what they are and how they work, and misinformation - for quite a variety of different reasons - is everywhere.

Also, there are huge numbers of internet marketers who have "tried ClickBank" (all too often by promoting high gravity products with vendors' opt-ins on their sales pages), been entirely unsuccessful ("surprise surprise") and want something/someone to blame, so these typically slightly hysterical, entirely inaccurate and ill-thought-through views may tend to be the ones most often propagated and perpetuated.

And clearly ClickBank would be losing money on those, because their 7.5% cut wouldn't cover their transaction and administrative costs of producing all those refunds. As they do happily explain, openly, to people who want to ask them about it.