> If new printers included a full capacity cartridge, it would create a loop-hole where anybody could make money by buying new printers, discarding the printer and reselling just the cartridge from it.

If the printer included a full capacity cartridge, the price would certainly be higher.

I bet half-capacity cartridges are much more expensive to the business than full capacity ones.

You need to produce a separate batch with different logistics and less volume than ordinary cartridges. In some cases it will need even a different testing line.

At least, you save packaging because you don't need to put then in a fancy blister...

Different quantities aren't limited to those sold with the printer.

My Canon can take regular or XL cartridges - the only difference is the volume of ink inside.