That' right, check Amazon's manga and graphic novel and anime bestseller lists daily, if not hourly, to spot trends and what themes and titles and creators are selling. There is a lot of quality literary material on the Amazon manga and comics bestsellers lists. You don't study the bestseller lists to produce a knock-off (well, I suppose you can, but I highly don't recommend it), but instead to keep an ear to the ground and observe what people want, what people read, and what they are actually willing to (get this) pay money for.
