That's part of the reason that GM has so many brands and car lines...they can't fire people. If they get rid of workers, they have to pay them a huge buyout package or send them to the infamous jobs bank, paying 85% of their salary. So, they figure they keep making the excess line of cars with a modest loss versus getting rid of the workers and taking a larger loss.
If all the Chevy and Chevy knockoffs GM offers were painted but one color, you would need spaces for 420 vehciles to allow a customer to see them all!
I think the marketing people at GM went insane some time ago ~ just totally flat out mentally ill type insane.