Most kids figure out that one of their parents is more likely to say "Yes", and it's usually the one who doesn't end up cleaning up the mess (e.g., walking the "puppy" after it stopped being cute, driving to the party to pick you up after midnight, etc etc).
Well, customers usually figure out that if they deal with someone who isn't doing the actual work, they're more likely to get a "Yes". That's what those intermediary roles are really about.