> There's negligible "overhead" to paint a famous work of art

...no? Duplicating a painting has a huge overhead. Either paying an expert to laboriously reproduce tiny intricacies of the original, or building and programming a robot to do it.

And of course you'd have to research all the paints, strokes, etc, involved.

> You can't just flood the market with fresh Ethereum block space any more than you can flood the market with fresh Banksies.

And that's the overhead, yeah. Even after PoS, it's still a network that doesn't scale. Thousands of computers are doing the same thing, repeating the same calculations and therefore not improving capacity in any way.