The artist becomes the artwork. The artifice here is precisely in "making it", in the act of convincing others of the value of the piece.
It's an acquired taste; I agree with you that not all people appreciate it. But surely, at the end of the pipeline, all this money must buy something of value?
And with passively consumable art such as music (which you can have playing in the background while looking at something else) it's that much easier. IIRC Blixa Bargeld predicted Spotify decades ago. Music on tap - like the power line and water mains; and that's all.