After the success of American Idol, television singing competitions have become widespread and popular around the world. Although this format has had a substantial influence on the music market of many countries, few studies have quantified this influence. This study examines whether musicians from singing competitions (contestants) earned more money through digital music sales than did other musicians (non-contestants). We used a unique dataset that summed sales from the top 200 monthly digital music chart of South Korea between 2011 and 2014. We analyze the number of the song sold during this tenure, considering several variables such as gender and seasonality. Our findings indicate that songs by contestants yielded larger sales than did those of non-contestants. This positive impact is greater for the top two finalists in the competitions. The insights gained in this study will provide guidance to record companies who are considering recording contracts with contest winners.