I know this particular game is winding down, since it's technically complete, but one thing that is still missing is an incentive to amass lots of money
the mechanic is there to get really rich, but there's no reason to do so, since you can get everything you need from space battles
I dont want to give half baked suggestions, but there's so many possibilities. Buying (a certain) captured runaway princess from slavers, using these supposedly intelligent sexbots on the ship, upgrading the amenities or rooms of the ship, becoming an actual eccentric pervert captain, instead of just pretending to be one, thus forcing the crew to decide if they want to remain on board, bribing the krell to be far more aggressive with their inspections/requirements, etc.