I think it is a combination of factors.
Interesting that a supposed Amiga "enthusiast" couldn't be bothered carrying away a whole system for a pittance at the car boot sale.
So it would appear interest must be sorely lacking.
There can also be family pressures:I just got a lot of C= goodies (someone else beat me to the Amigas) of a fellow who was under wife's ORDERS to get rid of that old stuff-I want my room back!
I think those who want an Amiga HAVE an Amiga (or two,or fifteeen).!
The ham radio classic radios also seem to be much lowered prices,the collectors must now have theirs so the demand is falling.
The current economy causes many to hesitate spending on non-essentials ,especially if a spouse will want to know WHY and HOW MUCH?