Someone caught the deal of the day! http://www.ebay.com/itm/1922-20-St-Gaudens-Gold-Coins-/141019931241?hash=item20d5716269
They will never see those coins. The seller hasn't sold on ebay in three years, has low feedback, does not specialize in coins and never sold anything of that value previously. This is a hacked account.
Six months ago that price would have been a pipe dream. But I concur with Tom, lots of red flags flying with this one.
I guarantee it's a fraudulent listing. They didn't use "$5000" since eBay puts a "hold" on questionable listings at that amount.