Almost all of the books that I really loved before getting into ebooks are unavailable in anything other than print format. All of the Tek War series, Douglas Adams' Dirk Gently books, and Bringing Out the Dead are the ones that spring most quickly to mind.
It would seem to me that out of print books and previously successful books would bring in quite a bit of capital with very little expenditure on the part of the publishers, but maybe that's just how I see it.
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