I never stay anywhere - parties, museums, meetings - longer than three hours.
Most museums - with all their burdens to pay for exhibitions, administration, and security - really don't have any money really to acquire art, with few exceptions.
Museums do not share their collections with other museums unless they get something in exchange. The Metropolitan will deal with the Louvre, but will they send their stuff to Memphis? No.
Any city in America would like to get a museum built if they didn't have to pay for it.