We've invested money in the readers we'd like to recoup. We're getting a copy we can't lend, resell, give away, or even display on a shelf. Why shouldn't we expect to pay less?
And we have options, when we don't want to pay full price for a paperback (and how dare wait for a cheap paperback when it's only a bit more for the hardback?). Amazon will knock some money off, for a start, and then there are bundle deals (3 for 2), used copies, remainders, borrowing.
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