When a cellar hits the 3,000-bottle mark, it enters a league of its own. In sheer volume, a cellar this size could easily provide a decade's worth of drinking pleasure. Intellectually, it affords tremendous luxury of choice by offering breadth and depth of selection, and alleviates the need to restock frequently. But perhaps most important to a serious collector, a cellar on a grand scale presents the opportunity to personally oversee a wine's maturation process over the years or decades, based on the multiple bottles involved. Wine Spectator auction correspondent Peter D. Meltzer explains.