If google earth and bitcoin was somehow merged....
People could buy land, your own back garden if you wanted... and mine for resources, how much and the logistics would be that of bitcoin, mine for gold, diamonds, trade....
Add a layer, allow people to buy wood, stone, brick from anyone who is willing to mine it and sell it on as a profit.
So we end up with the ability to mine, and that's all one might do, another extension would be to be a developer and make buisnesses like in second life, except you have to trade for materials from the miners or resellers.
So there's no main "interface" you just add layers, want to sell cars, you write an extension/plugin everyone else can download use, have no 3D interface and just mine in the space you bought...
A virtual economy based on a farhinite resource, once resources begin running out prices go up , the periodic table is there to be mined for people to build with, with the possibility of say real companies buying into the virtual space to offer electric to your homes and houses....