dudmont :
I suppose if it was made out of depleted uranium or some such material....
Uranium is just heavy and no good for cooling.
Pure silver on the other hand... but then the same size should weigh 2.17 kg (4.8 pounds).
Copper isn't much lighter at 1.85 kg.
I admit that a copper base, or even heat pipes, would be nice though.
We'll see where the actual price end up. It's possible that they charge a lot because they expect to sell only few anyway and need to cover the development cost.
The product page has at least one obvious error though:
"No fan means no dust and no maintenance over time."
If there's
any dust in the case some of it
will stick to the heatsink!