Because not everyone is honest enough, yet.

We currently account for our labor with chits. And we have to do this because we haven't developed an EXTREMELY high trust society.

Before then, we must get to a point where no one goes without necessities. Everyone must be fed. Everyone must have clean water. This must be worked out before we can go to the next step.

After most people are not feeling pressured to just survive, then we can start working on ways of exchanging our time for other's time.

In this time, most people will have some form of "free" energy. And the value of building will get reworked.

Somewhere in the middle of this, we start tipping everyone. Grandmas that watch the kids, now we make sure to tip them. People who give us useful directions, we tip them…

And, the thing we really need to work towards is comprehending how much we can give. Give too much and you get resentful. We have a long way to go to get here.