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You haven't mentioned the life plus 70 years of copyright. The publishers don't need get their investment back the first year it's published. They've got another 100 or more years with no further expenses to offset profit on ebooks. And don't tell me about the cost of the servers and people to run it. They can use the same one they use for payroll and other admin uses. The additional cost per each ebook is nothing. They can easily store all the ebooks they've ever published on a desktop, or more probably on Amazons server business.
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