Unfortunately, the poll results will be misleading because the choices are skewed. I had to choose Other because none of the other choices fit my buying habits.
In 2009, I bought more than 200 ebooks. Of those ebooks, only 4 were nonfiction and I bought those 4 as an experiment to see if nonfiction ebooks could replace my pbook purchases. They couldn't.
In 2009, I also bought approximately 150 hardcover books, of which (approximately) 20 were fiction. None were remaindered; all fiction were new releases generally as released. The nonfiction, largely history, biography, religion, and language genres, were new releases or special orders.
Finally, in 2009, I bought more than 60 paperback pbooks for my wife. She doesn't currently read ebooks and finds hardcover books too heavy and bulky to hold.
I do not buy "bestsellers" -- no Stephen King, Dan Brown, and the like -- so publishers neither gained nor lost a sale in that regard.
So for my buying habits, ebooks have replaced only fiction purchases. But even then they really haven't because the fiction ebooks I buy are from unknown authors (at least unknown to me and to bestseller lists), they are $6 or less in cost, and they are DRM-free. The Baen, Tor, and other fantasy/scifi authors that I discovered via ebooks who I have come to like and want to read, the publishers have lost my ebook purchases and gained my hardcover purchases -- that is, ebooks got me to buy hardcover books by authors that in the past I never would have bought or read, for example, David Weber.
Publishers -- and pollsters -- seem to miss the idea that there are several distinct bookbuyer markets that occasionally overlap but for the most part do not. It simply isn't concludable that the sale of a Stephen King ebook means a lost hardcover sale, nor is it concludable that the sale of the hardcover is a lost ebook sale. Without understanding why people buy what they buy in the format they buy it in, it is impossible to draw these conclusions, and no one has really researched the whys.
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