Saving money on the high cost of printing
In case anyone is still in the dark, printer companies are like razor companies - they practically give away the printer and are really in the business of selling the ink.
One thing some people don't realize (and may not be takin into account) is that some companies include part/all of the print head in the cartridge. It is not like you are paying all that money for JUST ink.
Personally I use my printer as little as possible. I buy maybe a cartridge every two years, and then usually only the black one.