Median income would be a better metric but still interesting. How much of that is via booked gigs though. I bet they draw income from a mix as well.
Discussion
I always believed that in the music industry concerts should make the most profit and not streamings. Selling physical records was always overprized, because you had the record labels in between. Digital records now making the V4V model available and concerts are the main income. I think there is no black and white right now