A money system without a way to make it law, can't be done, of course. But before the "money" there was society also in real life. Simply we know the money system like the better system we have...but well, we dont need it. Surely we need a better trade, colonization, regions, wars, being part of big city that have a big task and so on. So, give ourself something to do.
Personally i cant play whitout have in my mind why i'm playing for. Actually i have little projects, but if there will be the chanche, i'll already knwo what i want to do later, and are lots of bigger projects that probably could create new games for me or others, and so on.
This is a free world, and is what mostly make me play the game also if is fulfilled of bad things.
If the game is free, we are free to create a new type of game. The better we like.