That sounds insane. Several years ago my then-brand new Mazda3 hatchback was rear-ended, denting in the hatch right where the latch was, and scratching up the bumper. It was like $1,500 paid by the insurance of the person who hit me.
With that said, if you plan to keep the car for a long time and it's only cosmetic, I'd just leave it be, or spray paint it as the repair guy suggested.