It's what I'd call a
sunk cost. You feel like you've spent the money on the book, or already invested a significant amount of time, and don't want to throw that away. Rather, think of it as you've already wasted that time or money, so why waste more time?
Quote:
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In economics and business decision-making, a sunk cost (also known as retrospective cost) is a cost that has already been incurred and cannot be recovered.
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