Just for those who think the path to fame and fortune is through an agent and publisher, my dad (who has both) told me that he sold 500 copies of his book in the first year or so, and both his agent and publisher were thrilled with this result...
Granted, this is non-fiction, but still. He told me the real path to fame and fortune is gaining recognition as an expert in the field so he can do public speaking. He is connected with a major media company and actively pursuing this path. He does not anticipate major profits from the book itself, nor, does it seem, do his agent and publisher