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What I cannot understand why someone would do that?

Art for arts sake ...

The best art is equally open to all of our interpretations

Bansky is always provoking people. This is typical of him.

What does he think this is going to do to the market value of his art?

He's probably more focused on increasing his Street Rep than the price of his works. 😂

Because fuck you, that's why.

That's right.

There's more to it than that