HP are now offering these as a high capacity alternative to the standard cartridge set and have standardised on a single cartridge type, the 364 series, for many of their current and recent products. However 'High Capacity' is relative. HP rather quietly reduced the capacity of their original ink cartridges by about 1/3 and also dramatically raised prices. The high capacity version contains about double the quantity of ink compared to the standard version but that quantity is still rather less than 1 fluid ounce - in fact, about 60% of that! Very obligingly, HP charge only about 40-50% more for the extra capacity, so that it appears to be a bargain.
HP are not alone in this nefarious practice, and just about all the other mainstream printer manufacturers do much the same. The justification is simple: you may well buy a printer and it should last a number of years. In that time you will buy a number of cartridges and, as the printer was originally sold either at a loss or at a tiny profit, all the earnings can be made from cartridge sales. Compare many of the low end colour laser printers, some of which can be purchased for under £200. A set of toner refills can cost £250-350 and that does not include extras such as drive belts, drums, fusing oil etc, that may need to be replaced at fairly regular intervals. It is arguably far less expensive to scrap your existing printer and buy a new one than to buy the refills and I know one person who claims to have done precisely that at least once. Inkjet printers can follow suit.
As a considerable amount of ink is used and wasted every time the printer is powered up, you can exhaust a set of cartridges very quickly without printing a single document.
HP ink is very high quality and the pigment inks now offer bright and intense colour and excellent longevity and permanence of its prints if properly prepared and cared for. But the expense of the inks is off-putting!