Those pirates perceive the work to have no value. Possible reasons include that the pirate has no money, doesn't expect to use the work for long, or doesn't think they'll enjoy the work very much. The copyright holder loses no money when these people pirate their work and should not complain when they do so.<p>It's difficult to recognize why a person is pirating. For all I know, copyright holders have priced their works correctly and are complaining about people like this.