Also, I think a few of you guys are arguing past each other in the name of pedantic definitions.
Here's a couple things to think about: land isn't necessarily non-fungible. Say you have two plots of land. They're the same size, have the same access, the same climate, the same local regulations, the same elevation, the same drainage, etc etc. Before you say that's not a real case, imagine a huge plot of farmland that you divide in 2. Or take 2 corners out of, etc. They're not IDENTICAL, but for practical purposes such as growing food, they are the same. It would only be if you ascribed some other non-practical purpose that the 2 plots of land in this example would attain different values. IE: this one once belonged to my father, this one was the site of an alien landing, this one was where Napolean Bonaparte once caught the crabs, etc.
Another example which kind of enforces James' interpretation is the world of kit cars and reproductions. There's a company in Argentina called Pur Sang which makes EXACT replicas of classic cars such as Bugatti type 51s and Alfa Romeos of similar vintage. They charge around $300-500K for these replicas. In EVERY detectable way, they are exactly the same as the originals. Made the same way, same engines, same tires, dimensions, performance, etc. So that makes them worth the same as the originals, right? Not even close. The originals are multi-million dollar machines. Why? You'd be hard pressed to tell the difference without subjecting them to comparative metallurgical analysis or something. Well, the originals are worth more because the market says they are. And having the reproductions in circulation (in this case at least) doesn't detract from the originals' value.
Now don't get me wrong, I think we're in a bubble/mania of epic proportions with a lot of this crypto stuff, and ascribing long term value to ANY 24px piece of 'art' regardless of provenance is foolish. But then again I'm not setting the market either, so eh? If you can find the angles and ride the waves without getting dashed on the rocks, more power to you.