The problem with the RBE is that the resources on Earth are finite. So you must put a value on them and a money system is necessary. A better idea is the transfer of the file sharing model to the monetary system. You can share the coins like files, through a p2p network.
I can see putting a value on some things like my time and ideas, but why put value on the Earth's physical resources? Doesn't that just cheapen the value of human potential by comparing it with stuff just laying around in the dirt?