Mega Novella vs Giant Novel part 2: Now Weight For Last Year

I previously commented in this post on the trend of increasing size of science fiction novels. In his author's blog, Charles Stross has answered all my questions, and just about any other question you might have thought of, about the commercial and physical forces that shape the size of the sci-fi novel - including the way his own long novels have been divided up into several shorter texts. Novels are indeed sold like grocery items!