Among those who occasionally shop eBay perceptions about the rarity of unsmoked vintage (estate or NOS) pipes will often be skewed by the tendency for unsmoked vintage pipes to show up in sporadic spurts. For example, if a buyer checks in one week, they might find a seller with a half dozen or more unsmoked vintage pipes of one brand or related brands culled from the herd of a deceased collector or a closed tobacconist. The seller might list other unsmoked lots over the course of a month. A buyer shopping in that brief period of time may misperceive the actual rarity of vintage unsmoked pipes of the brand(s). Further, as the influx of vintage unsmoked pipes of a particular brand may temporarily depress the prices of smoked estate pipes bearing the same brand, that buyer will also miscalculate the average market prices of estate pipes of that brand. Having continuously watched the markets for the brands I like over a longer period, I would conclude that for those brands unsmoked vintage pipes offered for sale are rare in proportion to their age and/or collectability. Of course, original production duration and volume also matter. Know thine markets!