Mankind having evolved past greed and now working only to better themselves.
It's a good idea, but more like 53rd century.
Naw, it's more like the 1930's:
"Many of the normal motives of civilized life-snobbishness, money-grubbing, fear of the boss, etc.-had simply ceased to exist. The ordinary class-division of society had disappeared to an extent that is almost unthinkable in the money-tainted air of England; there was no one there except the peasants and ourselves, and no one owned anyone else as his master." George Orwell - Homage to Catalonia page 104.
But apparently to some on this message board, it seems, this kind of de-alienation is beyond reason.
"Hamin obviously found it hard to believe the Culture really did do without money.
'But what if I do want something unreasonable?"
'My own planet?' Hamin wheezed with laughter.
'How can you own a planet.?' Gurgen shook his head.
'But supposing I wanted one?'
'I suppose if you found an unoccupied one you could land without anyone becoming annoyed...perhaps that would work. But how would you stop other people landing there, too?'
'Could I not buy a fleet of warships?'
'All our ships are sentient. You could certainly try telling a ship what to do...but I don't think you'd get very far.'
'Your ships think they're sentient!' Hamin chuckled.
'A common delusion shared by some of our human citizens.'" -- The Player of Games by Iain Banks.