People keep wine collections for many reasons—to store wines for long-term aging, to always have their favorites on hand or to stock a diverse range of bottlings for nearer-term drinking and entertaining. Some collectors have pristine storage to preserve wines that might appreciate in value so they can resell them. But what's going into those cellars? Wine Spectator recently looked at sales of collectibles at commercial wine auctions in the United States: By volume, Bordeaux continues to represent the largest category of wine at auction, though it has dipped in value, while wines from Burgundy are growing as a category. But most cellars are being stocked with wines purchased straight from the winery or at retail upon release.