Want to strike it rich? Write something. At least that’s what an awful lot of people seem to be thinking about these days. They are writing the screenplay – or, since Harry Potter, the children’s book – that will overnight, pay off the mortgage, free them from the job, allow the kids to have a great education and pay for the rest of their lives to be lived in tasteful but significant luxury.” Trouble is – your chances of that ever happening are about the same as winning the lottery…