This comment is so patronizing because it's 2008 angst against the financial sector wrapped up in the assumption that the people participating in the financial sector aren't aware of that angst. We're deep in a hacker news comment thread, no one here should be beating the desk about productivity.
I would recommend you look into Bullshit Jobs by David Graeber, where he makes an argument that 50% of American jobs are not only not-productive, but actually harmful. Your argument isn't taken to its logical conclusion yet.
I'm well aware of "Bullshit Jobs", but that's more support for my conclusion that the modern economy has failed. Why do we have people doing bullshit jobs rather than something else? My argument is taken to its logical conclusion plenty of places in this economy, it's just not evenly distributed -- just look at the minimum wage being $7/hr juxtaposed next to an extra value mean being $12. That's a failed economy, sorry.