I suspect that for most authors who died over 40 years ago, the primary ebook sales are going to people who read them when they were young, and they are either buying to replace lost or paper copies, or buying unread stuff of authors they read back then and enjoyed. Since most of Blish's work has been out of print for decades, younger readers are unlikely to buy any of his works except for award winners, or Cities in Flight. So when I say nostalgia value, I mean the readership who will buy any of his ebooks out of nostalgia, and those readers are probably in their 50s or older, and the longer his works stay out of print, fewer nostalgia buyers will be around to buy them if they do get ebook editions, and the less likely there will be a resurgence of interest by the younger generations.
Point taken. Someday, I might get older than 50.
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