Most authors spend money to promote their books, but some get paid to do it. They’re media spokespersons, hired by companies and organizations to add credibility to a consumer product or service being promoted through a publicity campaign. They are topic experts who have the credentials to back their expertise. And they are paid $2,000 to $3,000 per day to help a company meet its communications objectives by sharing key message points through media interviews, while receiving impressive free media exposure for their books.