Modern art reproducers can make copies of the Mona Lisa that experts can't easily distinguish from the original. This kind of replica fraud happens often in the art world. I find it interesting to try to justify the value of the original when it is almost zero cost to have an exact replica of the original. The scarcity is not real, or at least the scarcity of being able to enjoy the intrinsic value of looking at the painting is not real. When you remove that part, the value lies only in being able to verify the authenticity of the work, rather than in its quality as art.