So we've got some behaviour that maps pretty closely to the behaviour of (very) primitive tribes, and what better to represent it than a monkey?
We all kind of grasp that the average company is full of monkeys. That you go to work, and all your co-workers are running around screaming, jumping up and down, and just generally not being very useful. They perceive that they have jobs, and that those jobs are different from other people's, and that they don't need to "compete" for their space anymore. But they still pretty much only care about themselves, in any reasonable fashion.