This article skips discussing one reason why jobs are in a sense ends to themselves: the feeling of being useful. Retired people often complain that they don't know what to do with themselves after leaving the workforce, so they go do things like volunteering. A friend of mine recently took 2 months off between jobs and nearing the end of that time, she started becoming very depressed and realized it was because she wasn't contributing to society or to herself. I think most people work not only to pay the bills or to acquire luxury items, but to have a sense of self-worth.