Would I ever doubt two such esteemed individuals as your good selves.....?
I wasn't commenting on the fact that they save a massive amount on the cost of the ink itself but they ARE placing you in such a position that you will have to buy a replacement cartridge (hopefully for them an original unit) much earlier than if a full one were supplied and still they are NOT breaching any trade descriptions act. Ipso Facto they are getting more income from the purchase of their printer! It's not rocket science really.
Me?? Prefer to drink Dom Perignon than ink any day hehe!