I've been listening to "How to Publish Your Book," offered by The Great Courses. In an early lecture, the speaker lists various resources an author should turn to in order to research agents. She says the fee-based resources offer higher quality information, and she first mentions Writers Market and then Publishers Marketplace. Though she talks about how PM gives great insight into who's buying what and who's active, I'm still unsure why PM would be worth the money. Why not simply use AgentQuery (which she later mentions)? In what way would PM be more helpful in developing a "target agent list"? Anyone care to venture an answer?