I'm sure some clever executive figured out they'd increase revenue enough before they were hit by a regulator or lawsuit to more than cover the subsequent apologies and announcement of their new firmware that loves free markets and customers SO MUCH that it accepts other cartridges again (but HP can't guarantee quality! So sad!).

I generally print things on the order of single digit pages per year, but some people do things like print PDFs to read them or still live in fax land, etc. E-ink is making some inroads, but a fair portion of the population does like text on something physical and highlightable and pen-markable.