Surely it is obvious "academic" books will be dearer than "normal" books, simply because they are almost certainly aimed at a specialist end-market, with relatively small numbers, and probably have a limited shelf-life, particularly in a research/theory heavy subject. Costs must be higher all round, surely.
And a writer has to be assured of the chance of a viable return if it's going to take, say, a couple of years work.
Biographies must be a good example, lots of research/travel/sweat/blood/ tears - and then you have to hope someone's going to publish it and someone else buy it !
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