Reality bites
Like any institution, individual or family, the State may not always have the resources it needs to do the things it might like to do and no matter how magnificent the works of art involved are, it would seem at least inappropriate to spend millions on paintings while so many pressing needs go unanswered.
That assertion would, in earlier times, have drawn accusations of philistinism, but in the digital age access to great art is no longer a matter of presence or geography.