Seems like you've chosen poorly. Think of it this way. if NinjaGirl is insane then she will not mind your spending far more time playing on the computer. After all there are lots of drugs available to psychiatric patients for free.
Also don't forget that cargo will have weight and weight will use more fuel. So hauling around extra cargo that may sell will cost you in fuel and could easily eat into what ever profits might have existed.
I am not aware of any other means to bring ones beer container to ones lips for consumption but to hold them in ones hands. Of course you might have some wizardry that allows for other ways.