Depending on the options and version of C7 ZR1 they are in that ball park on resale price, however good luck with any dealer paying you that kind of money for your ZR1 you're better to hang on to it till the right buyer comes along that knows what they want if you have the car that fits their list of "must haves" in a C7 ZR.
A person I know online is selling his C7 ZR1 in Ontario, he went to get a UVIP for his car and he was shocked what Ontario says the value is for his car, take a look at the attachment (certain important info is whited out for privacy reasons).
To the member that has that "SO" vert, a potential buyer may not share your "vision" of cosmetic mods that are currently on your car, so MO is if you want the money that your car could bring when you sell you should put it back to stock or close to it visually it would be more desirable to more people when it looks factory.
Tony