This is simple risk management. The risks are too big that you're paying someone $400/hr without the expected benefits. There's just a too wide margin of error.

This is simple risk management. The risks are too big that you're paying someone $400/hr without the expected benefits. There's just a too wide margin of error. Pay four people, things even out if and the whole thing just becomes more predictable (and thus easier to manage). Managers are often eager to pay the cost of predictability.