tl;dr if you want to scam dagw then make up a compelling story behind the art.

For the vast majority of the things you see in this world context will be lost and history will be manipulated or incorrect. If you're judging what you're looking at based on it's story, then the art isn't the object, but the creator of the story.

I mean, sure I guess. Tell me something is a lost Michelangelo and I will judge it very differently than if you told me it was a half way decent forgery from the 1970s. I find this rather uncontroversial.

For the vast majority of the things you see in this world context will be lost

And when that context is lost something of great potential value is lost with it and the physical artefact is much less interesting because of it. Even a mundane thing owned by a famous person or that has been part of famous event is always more interesting and valuable than the same thing without any context.

the art isn't the object, but the creator of the story.

Do you think the thousands of people that travel from all over the world and line up for hours to see the Mona Lisa are there to see a pretty good portrait that some merchants commissioned of his wife, or to partake in the story of that painting and its creator? If they actually only cared about the object as an artefact and an example of early 16th century painting, they'd be much better off studying high resolution digital images of it online.

The fact that a bajillion people went to see a picture doesn't make it art. It makes it interesting art. It was art the moment it was created and if had never been seen by another person even if they decided to destroy it on the spot.