Hiring an ActionScript developer is beneficial for creating interactive web applications, games, or multimedia content. They bring expertise in a powerful, object-oriented language that powers Adobe's Flash Player, enabling rich multimedia experiences. With their skills, you can create dynamic, visually appealing content that increases user engagement. They also ensure smooth, cross-platform performance for a superior user experience. Their knowledge of related technologies like Flex, AIR, or Flash Media Server can also expand your project's scope and potential. Hence, an ActionScript developer is a valuable addition to your team.