Various writers' forums are all abuzz with talk of a NY Times article (HERE)
published last weekend. It seems that the one-book-a-year model, long the standard for writers of mystery, thriller, or romance, is no longer good enough. Now publishers are urging writers to turn out (churn out?) two books a year. Or if not two, a novella or a short story in addition to the yearly novel.
Evidently the proliferation of e-books -- instantly available and often very low-priced or even free -- has something to do with these increased expectations.
Even best-selling authors like Lee Child and Lisa Scottoline have succumbed to this new model, keeping to grueling schedules in order to appease the appetites of their readers. I doubt they need the money -- I can only assume they prefer writing to the exclusion of pretty much every thing else.