Oh wait, everyone selling Amiga stuff is a crook these days, lol. :p
It's not just people selling Amiga stuff.
I put in a best offer on some console hardware, we went through some negotiating and agreed a price including p&p. When he sent through the counter offer it then added p&p, he said to pay it and he'd refund it. At this point I was starting to think he was probably a bit dodgy, but I thought I'd let it play out and contact ebay for a refund if he didn't. Then after paying he said that paypal had put a hold on the money for 14 days (I think it must have been a new paypal account). He said that because of this he wouldn't send the item straight away, which is stupid as the money is held so the customer will receive the goods before you can withdraw it. However I said it was fine, I was in no rush. He kept trying to convince me and then he refunded me.
I can't know for definite that people are dodgy, but if they do something that appears to be dodgy then it's not worth getting suckered by giving people the benefit of the doubt.