If you have the Supply And Demand perk and Anno as a companion, you can buy items from Gene on Myrellion and sell them to Anno for an ~8.55% profit

[untakenusermeme]

This effectively is an easy, albeit kinda slow, way of making infinite money.

 

[Wafflesnake]

you can recruit sera, start her shop and do the same without the perk and requires even less effort. not a bug, that's just the game.

 

[Nino]

Back when we could make custom bets, just playing Blackjack in Zheng Shi was the golden boy for money making