I'm probably preaching to the choir here: it's easy to imagine how many of those jobs would just vanish if our work was motivated by direct wants and needs rather than abstract money. If someone rich can just offer people a salary to be an anti-social lobbyist, union-buster, marketer or corporate lawyer, that's taking human effort away from actual work that needs to be done to fix this broken world.
When you start to add up all the bullshit jobs in the world, when you see just how huge the scope of its wasted manpower is, it's horrifying.