Estimated pages yield & ink volume?
Why does a full complement of cartridges cost more than the printer (8100 Pro) itself?
The manufacturer makes the printer with very low levels of ink in the cartridges so that soon after purchasing the printer you will need to buy more cartridges.
They keep the margins lower on the printer so that people will buy on the price of the printer.
Soon after purchasing the printer you then find out why the cost of the printer was so low, the cost of replacing the ink
Replacement ink is where the manufacturer is making higher margins on the product (they have you now hook line and sinker)