Some kinds of jobs make sense to me...People who make things, people who do things, people who fix things...I get that. The jobs that don't make sense to me are jobs who's sole purpose is to move money from one person's hands into another. That category includes telemarketers, bill collectors, and phone solicitors. People who pester other people professionally.
It seems as though there is a whole category of employment for people who can't actually do anything. Maybe that's a function of a sophisticated economy. Maybe when the world is full of people busy making things and fixing things and saving lives we need someone to call around and beg people to use those products and services.
But it's hard to imagine.