Here’s an illuminating take on castoff from Teresa Nielsen Hayden, empress of the awesome blog Making Light and editor of Robert Charles Wilson’s Spin, which just won the 2006 Hugo Award for Best Novel:
This morning I find myself thinking about how I went to the wall when Tor’s previous head of production grossly miscalculated Spin’s castoff, and wanted to raise its price based on her overlong estimated length. That would have been corrected when Spin was typeset, and the price would have been readjusted downward; but that artificially high price would have been in play during the period when advance orders were solicited, and would have resulted in fewer orders.
So it’s probably safer to underestimate a book’s castoff than to overestimate it (though I’m sure an accurate castoff is the goal, all around).
On Thursday I started working on a composition order for a book whose castoff according to the worksheet was 320, yet whose editor asked for a page count of 256. My response on reading the transmittal was a hearty snork. For a hardcover-only design I might have been able to do something about it (something uncommonly ugly, but that’s still something). However, because this book was to be shot down to mass market, and because it was supposed to be following a previously established series design that used a rather uneconomical typeface for the body text, the closest I could get was 304. When I took the sample pages upstairs to show Mr. Lint Trap, to my surprise he said that 304—or even 320—would be fine with him, and that the editor probably hadn’t even seen the castoff before making the request for 256. Okay, that makes sense.
The thing about hitting 304 pages vs. 320, though, is that there’s a retail price jump between them—$23.95 to $24.95—so the 304-page book will cost the publisher more than a 256-pager would in typesetting, printing, paper, freight, and everything else, but it might possibly make that up in sales by avoiding the chilling effect on the consumer of a 320-pager’s $1 higher sticker price. Possibly.
Then again, the typesetter may not be able to hold it at 304 pages after all. They’ve been hitting castoff with most of my designs, but occasionally something weird comes out. We’ll see.