Well, here is my twopenethworth.
The 3200's are fragile yes, but you cannot deny the car is the first stage of the rebirth.
It was massively over powered for the chassis which makes it fun.
The fragility shortcomings means most are now gone as scrapping them for parts makes more economical sense than to repair them....well, in the eyes of the commercial sector anyway.
This in turn means only the strongest survive and yes as stocks dwindle each year, the remaining examples will rise in value.
Simple supply and demand, with the AC commanding the strongest of values.