A pen out of Ink

What is the feeling when you finish a bar of soap, or run out of in in a pen. Why don't you feel it when you the roll of toilet paper has only 1 square? A woodsman feels it when he sharpens his axe, dull from a day full of splitting. A job completed. Is its opposite why it feels good to be prepared? If overdone are you cheating the system by rewarding yourself for something you haven't earned? Is it the opposite of OCD? The cure for OCD?