My part about entertainers was more in reply to the guy you replied to.
The arts at the Phd level is largely an irrelevant contribution to society, but the arts themselves are in the same direction as sports. My point was largely to say that while your post doc friends are not making much money now, if they are indeed doing post docs at the named institutions, they will do very well for themselves so long as they decided to pursue a field which people consider useful (which is, generally speaking, anything but the arts)