Wine Values

[PinotEnvy]

I was at my local Costco yesterday and they had some 2003 Chateau Ausone Bordeaux St. Emilion for $500. The woman at the checkout told me it was valued at $1,100 a bottle. My questions are 1) is it really worth that much! and 2) if it is, how does one go about finding a buyer at that price?

Thanks.