What happens when you go buy ink

Though with ink "drying out" (either for real, or digitally expiring) it probably does make sense for some particularly low-intensity users.

I'm guessing at least part of the price disparity is that they assume anyone with a clue will shop around and order online in advance of running out, whereas a harassed, last-minute shopper will gladly pay over the odds for the ink they need for their current printer rather than deal with the horror of installing new printer drivers in XP.