If you want a real con, have a look at Franking machine cartridges. £120 for about 20ml.
If you think of the old joke "how do you double the value of a Skoda? Fill up the petrol tank".
To fill up the 90l petrol tank of a £260k Lamborghini Aventador with that ink would cost £540,000. It would triple the "value" of the car.
Chanel No. 5 is substantially cheaper than printer ink.