Earlier quoted context omitted.
It's probably to avoid/mitigate lawsuits. It's possible that this would still be covered under false advertising but there's something to be said about the feasibility of testing a lot of unopened packages to show the ink level is low vs having to run all those packages down within the parameters of the device (so the testers aren't seen as the cheaters, over-using the cartridges to make the problem seem worse than i…
There's a lot a wiggle room in saying that your ink is almost out. The simple defense is that they don't want people to have wasted prints, which might happen if the ink for one color actually runs out, so they notify a little earlier. That "little earlier" is vague and relative, giving a lot of defensible ground for a lawyer to work with if it comes to that. Stating you are selling a certain amount of something and…
Plus, increasing the actual volume of product you sell without relying on a commensurate increase in demand is basically printing (heh) money as far as corporate returns are concerned.