(Reuters) - After buoyant wine auctions that saw booming sales, most auctioneers believe the only bubbles in the wine market are in the Champagnes poured during the bidding. Chicago-based wine merchants Hart Davis Hart reaped $4.9 million at its Lafite auction on Saturday, reinforcing its image as the most sought-after, top growth Bordeaux. And on the same day New York's Acker Merrall & Conduit sold $2.3 million at its auction.