The Dark One
Auror
In my experience it is significantly more expensive to print longer books. I'm in Australia though and other countries might have better economies of scale.
My first book (when sent in and accepted) was 230k. The publisher said: I love it, but I'm not publishing more than 160k...up to you to get it down. We compromised on 190k but from his perspective the driver was very much the cost of going over 400pp. In fact, it finished up at 525pp but still far cheaper than it would have been.
The story was a lot tighter also.
My first book (when sent in and accepted) was 230k. The publisher said: I love it, but I'm not publishing more than 160k...up to you to get it down. We compromised on 190k but from his perspective the driver was very much the cost of going over 400pp. In fact, it finished up at 525pp but still far cheaper than it would have been.
The story was a lot tighter also.