Here is my message and the reply I got from the seller:
Dear adz929,
You asked:
"Hi Larry, just a little curious regarding the A2320 board you have listed at the moment, do you really think that it is worth over AU$400? Not really any of my business, but I know I wouldn't pay that much for it, so I hope for your sake your not being taken for a ride, either way, I plan on reporting the bidding actions of your two highest bidders to eBay as this looks like a clear cut case of shill bidding."
As far as i am aware these are both genuine bidders. It is not for me to decide what it is worth, it is what the market is willing to pay for it that determines the price. Thanks for your concern and feel free to report it if you like. We'll wait and see what happens.
In true Aussie spirit, I shall simply say..."Ahhhh f*** it!!!", I hope the little prick gets the shafting of a life time, obviously he has no idea who the market really is. Matters not to me really, I can get most parts I need outside of eBay, eBay just provided an convenient means of browsing.
TBH, his attitude only hurts people like himself, sellers. Eventually genuine Amiga buyers will turn their backs on eBay then the sellers will be left with nothing but scammers and time wasters.