Some of the really expensive stuff has dropped loads. But the cheaper, still collectable stuff has gone up loads. A nice mk1 Golf GTI will cost the same as a GT3 at this rate 
But I think we'll see a final run of some epic cars just before 2030. Then that will be it, buy one and run it forever because the golden age is over.

But I think we'll see a final run of some epic cars just before 2030. Then that will be it, buy one and run it forever because the golden age is over.