Modern art (or just art), it's more a money laundry, tax evasion, asset management scheme than anything else.
If art was more about tax evasion, etc, then modern art would probably be more photorealistic or otherwise difficult to create (since this would make it easier for outsiders to assess the scarcity of an asset)
But I agree that the modern art market is multifactorial in nature and that there are elements of both involved.