It's certainly odd that supply versus demand doesn't create more value for our cars. I've said it before and I will say it again, I constantly get people raving about my 968's at the track or out for a drive. All unsolicited. They tell stories about how sorry they were that they got rid of theirs or how they always wanted one or how it was always their fav. I smile nod and say thank you.
I didn't buy my car for it to appreciate. Wouldn't mind if it did though. I came in as a novice with zero knowledge of the 968, Porsche or even cars for that matter. I had a friend who was unloading his and I knew he kept great care of his cars. I lucked out. The second car was purchased for the track and I had plenty of help here from the Forum in deciding which car to get and if the one I chose was a good choice.
This path has been expensive and I could have bought two Targas for what I have shelled out for everything. But the cool thing is I own rare cars, have met and developed interesting friends, have a reservoir of knowledge to tap, and am having fun.
So perhaps in the long run the value in my cars has grown by virtue of all of these intangibles.