I've noticed ad agencies are not creative, and only serve one purpose. When a company enlists an agency for advertisements, they're not asking for creativity, they're paying for "rights" to have the generic cookie-cutter ad.
You've seen it, you know what I'm talking about. Especially movies, that use the same formula for previews. People buy what they're familiar with, and what's popular. So when someone purchases "rights" to have the generic advertisement, they're basically just saying, we want to be generic and uninspired, and by buying 'Generic Ad Formula A', we will have guaranteed sales with the robotic consumer public.