I believe you are right. It is not really the way in which the content is purchased that impacts whether the content creator can earn, money can come in via multiple streams, all are welcomed.
I believe the issue arise from the leeching along chain on one hand and the mentality (at least in music and film) to potentially lose money on many artists as longs as we can make insane returns on others. This is where building an industry where the top 10-20 is the jackpot works, as long as one of your horses lands the spot each year.
Marketing, as in most industries is to blame… most of my problems always come back to the same man… Edward Bernays.
Can Nostr solve marketing driven market concentration? Possibly. The advantage of nostr vs other platforms is that there is no concentration of market analysis. The data is sort of open to everyone. Market analysis, marketing strategies and so on could benefit from a healthier competition amongst them.