Well, stock market sucks (and always will...), so I guess people try to make money out of speculate with desirable sports cars. Adding to this is the fact that owning a classic car is trendy nowadays (not sure why) and people who were growing up in the '80s can now afford the car they've been dreaming of for the past 20 years ! All this pushes the demand, and the prices.
My 2 cents.
