Great article by MediaPost on why Agencies still matter.
"just as automated trading systems don’t make financial traders superfluous, neither does programmatic ad buying eliminate the human element. There is still a lot of human capital involved in setting up, running, managing and executing programmatic ad campaigns. Each brand will need to decide for itself how much of a role it wants to play, and what the functions of agencies will be."
More at Programmatic, Not Automatic: Why Agencies Still Matter 09/02/2014