This is a neat and not very common device... but I agree, you're still asking too much. You might eventually get some desperate person to pay that but most likely not.
I'd make an offer of what I'd be willing to pay, but since I don't have any Amiga game consoles and have several "real" Amiga systems, I don't need this and it'd just make me have to go find a console to hook it to haha.
If you're really desperate, sell it for cheaper. Start bidding lower than you want (you could always do a reserve price too) and see what you get. Or put it on Buy It Now at a lower price you'd be happy with... or just keep it, some day you might be glad you did.