Chris McVeigh-- he runs FourFiftyOne a digital publishing consultancy as well as seoforbooks--said, "SEO is a huge opportunity for Indie authors to become discoverable" adding "it is not a discoverability but a visibility problem for many authors."
Have you had a ride on the 50 Shades Of Grey bandwagon yet? Or is it a gravy train? It's hard to tell - the seats are all swings and the seatbelts are handcuffs. I'd ask the driver, but he's been told to keep zip.