if that's the price of a cartridge, and i need that much ink in a month, then sure. but if i don't use up a whole cartridge in a month, or even if i use it up faster, then there should be an option to get the next one only when the current one is empty. why should committing to a fixed amount be the only option?

charging by pages printed is just creative accounting and unfair to those that print lots of pages with little ink, while giving an advantage to those who use lots of ink per page. what's more, that's information i don't even want the printer company to get.

there is only one benefit to charging per page: print shops, because they charge per page too, so the cost and profit margin per page will remain the same regardless of how much ink they need.