Estimated pages yield & ink volume?
Why does a full complement of cartridges cost more than the printer (8100 Pro) itself?
Printer manufacturers (HP, Lexmark, Epson, Brother, etc.) make their money off the consumables/ink/toner, not the device itself. Look at how much ink you typically put on a page, the cartridge yield is most always half of the documented yield because people cover the page with more ink than just 5%