I think most of the appreciation will come for the 427 cars. Like all muscle cars they won't truly increase in value for 10-20 years when cars like that are no longer available. It takes time. Remember the original 69 ZL1s wouldn't even sell new. So, appreciation, if any, will come somewhere down the road.
The reason I bought one is (in my humble opinion
) I think the last generation of Z28/SS Camaros is vastly unappreciated. And I love the car.