Ideally, a book price should be proportional to its publication cost. Since some books and topics have potential for higher sales, publishers increase the price. What I do not understand is why a book with public audience costs a few dollars, but a technical book (with the same printing costs) can be a few hundred dollars.
I speculate that one reason is that a technical book has a lesser number of potential sales. Of course a publisher would expects a decent revenue from each book project, but but I cannot understand why the increase in price is so extreme. I wonder if this high price is part of the reason for lower sales in the first place, creating a vicious cycle.)
Is there any standard scheme for determining the price of a book? Or do publishers increase the price to as much as the book will sell?