When I sell a copy of Raven's Gift at Amazon, I earn three dollars. But if I meet you in person and sell you a copy I just happen to have with me, I earn seven. But there's a catch: you're likely to want me to write something in the book.
My handwriting is beyond terrible. For years, nobody has had to read it. I stopped caring that I couldn't even read my own handwriting. But just imagine the embarrassment if I write a short message in your copy of the book, and it looks like I couldn't even spell your name write.
Got to brush up.