According to Class Central investigation, Johns Hopkins Data Science specialisation (which cover basic data science flow parts with applications in R) generated ~3.5M dollars (between April 2014 and February 2015).

Also, very interesting numbers:

• 1.76 million course sign-ups
• 71,589 Signature Track verified certificates were awarded
• 917 students completed all 9 courses and signed up for the first capstone course
• 478 students successfully completed the first capstone course