HP ink cartridges
"HP put chips in their ink cartridges and use intellectual property law to prevent others from cloning the chips, so that you become tied into their printer consumables ecosystem."
Ah, but what you failed to mention is that HP uses the money they make on their printing business to subsidise their PC business. Their profit margin on PCs was and may still be only about 1%, thus if you buy an HP PC for say 500 USD, they only earn 5 USD on that. This figure is taken from a financial report around the time Fiorina left HP, so the profit margins may have improved slightly under Hurd since then, but the fundamentals won't have changed: HP subsidises their PC business with revenue from their printing business.
In other words, if we all stop buying those overpriced printer cartridges from HP, then HP PCs would be significantly more expensive or HP might even stop selling PCs altogether. Those companies have to make profit somewhere.
BTW, this is reflected in the valuations of HP as a whole and its printing business. Strange as it may seem at first, HP's printing business is valued higher than the whole of HP and many HP shareholders are on record to prefer a split of the two. If that ever happens, the HP core (without the printing business) may entirely abandon the PC business and focus on servers and consulting.
Note, that Apple used to carry loss-leader products (like HP still does) in the 1990s and it almost bankrupted them. When Jobs returned to Apple, a strict no-loss-leaders policy was introduced and this is part of the reason for Apple's revival. No product in Apple's portfolio is subsidised by revenue from any other product, if any given Apple product isn't profitable, they kill it, the G4 Cube is an example of that. During the last 5 years or so, there have been many quarters where Apple was the only profitable of the big computer vendors. So, from a business perspective, they seem to be doing something right.
Same with IBM, they used to subsidise PC notebooks and desktops with revenue from their PC server business. Not anymore. They sold the unprofitable PC notebook and desktop business to Lenovo so they won't have to subsidise those products anymore. IBM has become more profitable in the process. Maybe Lenovo can make it work at the same price points, maybe they can't, only time will tell, either way, it's no longer IBM's problem. Again, they too seem to be doing something right.
Morale: For the long term sustainability of a company's business, ranking high in profitability is far more important than ranking high in sales. Most folks seem to foolishly disregard this fact.