Except the GP quote actually happens.

For example, if you've ever wondered why useless art trades at such eye-watering valuations, the answer is that the high valuations are fictions that governments will accept for tax purposes, from which you can derive a variety of exciting tax consequences: https://naturalist.gallery/blogs/journal/understanding-the-f... more-or-less because they agree among themselves what the art is valuated at for their own benefit.