According to the latest version of 7th Sea 2nd ed., it's reasonable to assume that you will be making around 2 wealth points/2wp for selling your cargo. That is supposed to go into the treasury and will be halfed (round down) every game session. The reason given is upkeep, repairs, provisions and payment of non-hero crew.
My first question is this. If you aren't paying the crew does that mean the wealth doesn't go down? After all, you are still responsible for upkeep, repairs and provisions.