Anyone know a good resource--or have info--on sales figures for fantasy novels? Specifically, I'm curious about the sales of something like Jordan's Wheel of Time books vs. something like Crowley's Aegypt books. Where does Guy Gavriel Kay fit in? Steven Erikson? Gene Wolfe? Are there "tiers" of fantasy authors? What sort of numbers is considered a success for a first-time fantasy author? At what point does an author no longer get book contracts due to declining sales? Etc. Anything would be helpful.