Finn KNOWS ABOUT MONEY...his brother just, rejects capitalist systems and raised him to also not care about it (ie/ not know how it works). They just find treasure and use that, or trade it
Finn needs to also not be allowed to have cash money because someone could definitely tell him it costs $400 to get your shoes dry cleaned and he’ll be standing there with no shoes and no money for the rest of the day wondering what the fuck happened
There’s cool stuff in there if you really look