Instructors are the most important component for the development of a Massive Open Online Courses (MOOCs) because of many MOOCs have been developed by instructors and offered free of charge. In this study we examine the benefits of sharing and course design actions during the enforcement of a MOOC. In this study a qualitative research design, case study, was used. Interviews were made with 12 instructors who have offered MOOC on AtademiX in Turkey to understand their gains while developing and teaching MOOCs. The data obtained through semi-structured interviews were subjected to content analysis and the gains of instructos were revealed in an inductive manner. According to the results of the research, instructors have made professional development and achieved new academic outcomes such as tendency of material sharing, satisfaction, recognition, self-confidence, and effectiveness in face-to-face lessons. As a result, it can be said that MOOC contributes professionally and academically to instructors.