Printer ink is more expensive than blood!
While a printer is relatively cheap compared to what you might expect, printer companies make a majority of their money on the ink! Over the life of just one printer, you’ll most likely pay over 500% of the price of the printer on just refilling ink cartridges.
A traditional ink cartridge of 42ml costs around $30, for just plain black ink, while the Red Cross charges $200 for 500ml of human blood. This means that while blood comes out to 40 cents per ml, ink costs 71 cents