We're not getting paid for this mission to travel all over Europe and bring back a gun!
Ok, sure we captured and sold a ship, but all that gold ended up in Mayweather's pockets eventually - "Lady Catherine's Suites" discounts or not, we still traveled across France, Naples, Russia, Serbia, Lichtenstein, Genoa and Spain before sailing home.
I'm pretty sure Mayweather makes more gold from the party staying at his hotels than he ever gained in loot.
If Pozzo wants to make the REAL money, then Pozzo and du Sang need to blow off all these political missions and go after the Golden Eagle of Hensel...
I think the other two characters who knew of it's existence are dead...