In this thread you post the most valuable coin you have seen on eBay. You need to post a link to the auction.
Im pretty sure that the link above is the most expensive one that has been on ebay for quite a while.
That one is in the red book and it says that it was sold in November 2005 for 2.99 million dollars. This is much more that that.
I don't have access to eBay where I'm at right now, but the most valuable coin was offered by Mike Byers at $3MM if I recall correctly. I think it may be a Proof High Relief St Gaudens $20. I do recall some other seller once offering at $10MM a high grade common date gold coin that was easy to confuse with a landmark rarity. I contacted him, and asked if it was a typo, and he said no, and insisted he had every right to take that much money from anyone dumb enough to pay it.
http://coins.ha.com/c/item.zx?saleNo=392&lotNo=6522#16611661927 Here is the link to the heritage website where it sold. It truly is an amazing coin. A microscopic spec away from being flawless.
Wait... I'm having a vision.... someone will come and claim to own a $14M coin and post it over, and over, and over again.