Also there's also a huge factor of whether a model is or was loved and that certainly plays a big part. VL is one of those that was a bit of a strange situation, originally it was loathed due to the Japanese engine replacing the Aussie 6 and Holden being seen as a bunch of traitors but once people test drove it and word got around that it was Holden's best ever car made up to then, then people's perception changed. Once VN came out many people thought that the VN was an ugly looking car and went searching for low Km examples of the VL model in it's various luxury levels and engine combinations, especially the Turbo variants. I bought my low Km VL Berlina back in 1990 and even then it was hard to find a really good one at a sensible price. I paid $14,500 for it back then and sold it 6 years later for 9K when most were fetching around 3 to 4 K.
So the topic of VS comes around and yes I have 4 really good ones, but do I think they'll be something to crow about in a few years time.................I think not. Ok really good Ecotec examples will hold a reasonable price, but they won't skyrocket that's for sure. The original V8's on the other hand will most certainly hold a good figure to a certain few, but who knows how the changing landscape of the Automotive industry will affect pricing of older cars.
Some people think that just because a car reaches a vintage age that it'll be worth heaps...........well I'll call BS on that theory, just take the mighty Mitsubishi Sigma as an example. It is the only Japanese orientated car that no matter how good of a condition it's in will only fetch around $1,500 tops while Datsun 120Y's are appealing to the masses again it seems, yes to slot rotaries into I know.