The new Z06 is rated at 505 hp and I believe is under 3200 lbs.
It has a carbon fiber body with an aluminum lightened chasis. It has titaniun rods and valves (intake). There are performance tweaks every where. Its nothing like the standard corvette. It just looks similar to one.
Its a steal at $66k. With the limited production, I doubt Chevy makes much money if anything on it. The vettes in general are built just to keep up the icon status. They are not built with making the bread and butter for the stock holders and CEO in mind. Without the Vette, GM has no icon to show off.