Making a living as a writer has always been an elusive pursuit. The competition is fierce. The measures of success are subjective. Even many people at the top of the profession can’t wholeheartedly recommend it. The critic Elizabeth Hardwick, Darryl Pinckney recalls in his evocative new memoir, “told us that there were really only two reasons to write: desperation or revenge. She told us that if we couldn’t take rejection, if we couldn’t be told no, then we could not be writers.”