Profit analysis.
From Fallen London Wiki
Ten cases of Morelways - 240*0.1-1000*0.02=4Epa;
An alarming amount of Strangling Willow Absinthe - 96*0.5-400*0.1=8E, but two actions, so 4Epa;
Perhaps you're interested in an exceptional vintage? - 24*2.5-5000*0.01=10E, but three actions, so 3.33Epa;
An improbable exchange - 62.5+5*0.25-5*12.5=1.25Epa;
A potent possibility - 312.5-7*62.5=-125E, so 125 Echo loss;
A dangerous deal - 1562.60-5*312.5=0.1Epa.