I’m frustrated

Please make your more expensive ebooks available on Kindle

I just purchased the O'Reilly book "Why Programs Fail". Even on sale at half price, $36 is the most I've ever spent on an eBook. It was a real disappointment to see that this expensive book is only available in PDF format. Why is it not available in the .mobi (Kindle) format? Your $20 "Super Scratch Programming" eBook I purchased for my niece is available in epub, mobi, and PDF. What gives?
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