Hi
Yes they are after money sometimes. But if the Amiga got sold, there would never be a transaction, and if there were, the seller will get the money. How can they get money from doing this.
They want you to contact them direct, my guess is you'd pay them through some way that couldn't be reversed. While most sane people wouldn't do the latter, they filter out those by making it look dodgy. They only need one gullible person.
It's the same reason why the Nigerian scams are so over the top.