One of my pet theories is that this is driven by what sorts of things bookstores are willing to sell, and at what prices. If they will only sell book length wor

One of my pet theories is that this is driven by what sorts of things bookstores are willing to sell, and at what prices. If they will only sell book length works, you'd better pad your idea with 200 pages of fluff, and if you want to charge a lot, better make it a fancy hardcover. It used to be you could publish in a magazine, but those are near dead.