The cost of the books I read is nowhere near the costs you are showing.
The books I want to read in hardback are around £19, the paperback drops a few quid - £9/15. and the ebook is often about £2 less than the paperback and ditto for the hardback.
It's a red herring to include the price of the eReader into the total cost of the procuct because that is as long as a piece of string.
When the book is now encapsulated in its digital/electronic form from author to production point the handling costs of any book is virtually nil until it comes to plate and printing. And when it comes to ebooks the download is almost its total cost. There is more effort required in producing the Bible/Shakespierre than there ever is in producing a modern auther for ebook