I don't know whether this was supposed to be just a funny post, at least the remark on what happens in GB to Euroboxes after five years made me insecure.
There are/were two reasons Morgans were restored in UK:
1. Many cars are like family members.
2. Financially it made sense.
Look what happened with Jaguar E-types. When prices rocketed much money was invested in cars nobody had touched before because it didn't make sense to invest money.
Rod - 5 years is obviosuly an exaggeration. Some itallian cars in the past (lancia beta! Astra etc) made it to the scrappy well before that five year time frame. Many company cars are tired and ready for scrappy / taxi after 5 eyars at 40k+ a year. Many more in general usage will run for 10-15 years.
I guess my point was - as you make so clear, that a morgan isn't an average eurobox - it is special, and therefore they do not get 'retired' / broken for spares unless they meet a tragic end in a hedge somewhere and really are unviable.
My key point is that, the stock of morgans does not reduce - therefore the available pool to buy from is ever increasing. (nothing to do with other cars) Purely that the pool of morgans you can buy is constantly increasing, andd becuase of enthsuasts like us it grows year on year as less 'die' than are born I should imagine.
As an ever increasing resource, it's hardly suprising that values do not stay static, but fall.
As the number of enthsiasts buying morgans seems to be smaller than it was (in relation to the availability if not in absolute numbers) the price of the commodity will fall...
Just market forces - nothing sinister!