Long story short. Next "arc" of my campaign has the players taking a wayfarer around on a tour of the minos cluster, and they are going to have to haul cargo from planet to planet in order to maintain the ship and pay for repairs.
I am really really hesitant about making it a bookkeeping game using Nevermind's Trade Route Economics Tool Version 1.1 and i doubt my players would be able to fill the cargo hold of the wayfarer.. nor sell enough of the cargo to cover the cost of maintaining the ship, refueling or docking fees