Classic case of supply and demand. Before the crash, People had money (they thought

) and were willing to spend it on NOS parts that were not around. I would see a pattern of parts rarely up for sale until one of them came up and went for big bucks, then you started seeing a bunch more. That was demand affecting supply.
Now that demand had fallen off (the average joe doesnt have play money anymore) the amount of parts will shrink. I know I have not sold recently for that reason.
When it gets bad enough that people in need (lost job!) have to sell projects and parts, I think we will see prices going down. I think this is happening already. I seem to see a lot more projects on the market.
Soon might be the time to buy if your $$ are in good shape