Are a good novel and a successful novel necessarily the same thing?
A good novel and a successful novel are not the same thing, necessarily. A successful novel is often based on an idea, a high concept such as "The Da Vinci Code." But such books are not known for their quality of their prose or for their quality of characterization. I think ultimately all successful books have something, but some of the greatest novels of our time have been a slow burn. "Moby Dick" would be a good example of a book that took sixty years to come in to the public's attention.