I appreciate the feedback! I'd love to keep the money moving through nodes, but it just isn't scalable. My vision for this game is for you to have enough nodes to cover the globe, and it simply won't scale to have state for every node. There might be another game concept where you more carefully manage the graph as you're describing, but it would need to have a much smaller amount of nodes to manage, so it won't be this one.
Fair enough, I know nothing about creating games. I do hope however you solve the problem you include the physicality of the node network as part of the strategy a player has to consider. Looking at the geography of how I might eventually expand the network to europe, asia and africa and seeing how chokepoints and geography might affect my expansion was a lot of fun.