That's the trick. We don't have to worry about 'sinful human nature'. At some point thing would turn upside down. People WILL be willing to work, because, as I said, work (a real work) will be too scarse. You can do nothing and get anything from that, but really, how boring this would become eventually? No goal, no focus, nothing to do... I see more problems in this area rather than in 'wealth distribution problem'.