Who else do you think is going to buy it?
Apart from nostalgia it's all worthless.
Isn't nostalgia and human sentiment what gives almost any physical object monetary value in this world? Nostalgia is just another way of assigning human desire to a physical object, and once that's done an otherwise useless item has real worth (paintings, diamonds, gold, old cars, fur coats, beany babies, etc. etc.) - in that you can get someone to pay for it.
So, monetary value derived from nostalgia is still real value.
It's not like the Amiga is unique in this regard. Very few things in our society are actually are intrinsically worth what they are bought and sold for.