You said you find the ebook cost excessive while expressly comparing it to the hardback. I eagerly await your list of qualities that distinguish the two and are not the material embodiment of the artefact -- and that you, presumably, feel make the ebook version inferior, since you're not prepared to pay the same amount for it.
I don't recall saying anything about Cory Doctorow's words being divine truth, so by all means feel free to argue with him. Or with the NYT, who actually pulled together the numbers.
Of course, those are based on a $26 cover price for the hardcover, and seeing how Amazon is offering the hardcover at $15.45... If anything, you should be amazed at the low price of the hardcover, not decrying the high price of the ebook.
You certainly have the freedom to buy or not buy a book in your preferred format, at your preferred price. What you don't get to have is your own reality in which I said that the cost of production did not contribute to the cost of physical books.
What I did say was that the cost of materials accounted for a minor proportion of the total production cost of a book. If you want to argue with that statement, please bring along some numbers to support your position.
As far as this pricing structure being outrageous, though... Consider this for a moment: If the book was offered only in ebook form, would you still be outraged over the price?
Price anchoring is a real thing. Just as you're outraged because your preferred format is too close to the hardback, which is perceived as being more of a luxury, people whose preferred format is the hardback are being subtly encouraged to buy because of how inexpensive that format is, compared to the ebook. And since physical books are taking back market share...