This is such an awesome Auction! and trust me you will get a very decent offer by the time the Auction is over. I can’t say that it will reach $200 currency, however it could reach at least like $50 which is 5M+ you might even get like $100 (10M+)
You don't have to Refund credits if it's their Fault for not reading description that you ask for shipping fee...and also if it's their fault they can't put negative feedback if you don't Refund them.