The selection of ebooks is a bigger issue than price for me. When I want a book, if I can find it in the Sony eBook Store I'll pay up to $20. Well I will do when I have some credit on my eBook Store account. But usually the books I want aren't there... luckily I have other sources that are much more efficient and free
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I think the future of ebook sales will be like mp3s: it will always be easier and quicker to get them pirated. I don't think I'd pay to hire ebooks but I'd certainly be more inclined to buy a book if I knew the money was going straight to the author.