Everything depends on what type of ads he is playing and how mutch people are clikcing on them but in 2013 the avarge was for every 10000 views you would earn around 2$-8$ (with sponsor, and on avrage). So math here. (4000000 views per video / 10000) * 8 * 7 videos per week * 4 weeks per moth = ~90000$ per month only…