If not, what's in it for the GB?
But seriously, how is it supposed to work? Pictures of JWs in paradise show them raising crops, wearing clothes and building houses. They still have to eat. The distribution of labour between various projects, needs and priorities has to be rationed out somehow. That's the role of money in the current system. Something like it would have to take its place. Unless the plan is abject slavery. (It's not like the GB hasn't already been grooming the JWs to think of themselves as slaves)