Why don't you take some time to listen to the podcast before getting angry about the market or someone else's privilege?
Also, maybe you missed the part where there is 10x-100x the amount of art sitting in the archive than on display? Bringing lots of new supply of art onto the market would necessarily lower prices. This would make it less profitable to buy up art privately in the hope that it appreciates. It would also make it more affordable for other museums.
At the same time, there's nothing preventing a first-tier museum from only selling to other museums rather than to private collectors. They might even stipulate terms of the sale that the art must stay with the new owner for a minimum time frame.
Also, maybe you missed the part where there is 10x-100x the amount of art sitting in the archive than on display? Bringing lots of new supply of art onto the market would necessarily lower prices. This would make it less profitable to buy up art privately in the hope that it appreciates. It would also make it more affordable for other museums.
At the same time, there's nothing preventing a first-tier museum from only selling to other museums rather than to private collectors. They might even stipulate terms of the sale that the art must stay with the new owner for a minimum time frame.