Perhaps I could reply to your satisfaction.
You say that you are a writer but you make no mention as to whether you are a commercially published author.
I am.
Firstly, did you know that the commercial shelf life of a book from even an international best seller is three months, before the book becomes remaindered.
One of the greatest problems for an author is getting enough publicity and believe me even if you go around doing talks (which I have) you will never get enough.
So I personally would see it as a sign of success for a book to appear on a site like this for it would mean that my target audience is increasing.
Secondly, I have read lots of books on screen whether it be on the pc or pda but I will still go out and buy that book in hard copy if I have really enjoyed it. I have also bought books with joyful anticpation only to be absolutely devastated with them ,an example being "Mostly Harmless" by Douglas Adams.
Thirdly, If you think that this site is bad then try buying some books off ebay. I recently paid less than 5 euros for 2 dvds of science fiction. Much to my surprise the dvds contained many current authors who would be surprised to find their works on such discs. The discs contain in the region of 10,000 books.
I personally have a library of about 5,000 paper books from 200 years old to those published last month but if I see a book on this site I will look at it to see if it is worth buying.
If you care to look at some of my puzzles you will see that I recently whimsically suggested I might publish a book of them and having recently met an author of learning type maths puzzles for children who is published on disc I might just do that. Hmm let me think, how many members and browsers are there on this site that might just decide to buy it even if it was availlable to download from the e-books section?
Does the above allay your concerns?
p.s Incidentally some authors are now making their works availlable free for electronic download but plugging the hard copy as well e.g
http://www.geoffwolak-writing.com/index.htmlNo that is not me.