There are two categories where knife collectors will never use knives in their collection. Most, because they are an investment. Serious collectors will purchase older knives in as near to mint condition as they can find and with as much of the original packaging as possible. Depending on how rare they are and how collected they are by others, the value of these knives fluctuate with the market and will most always increase in value as time goes on. Another category of knives that will never be used are knives that are basically a work of art. So, many collectors will never use the knives they collect. These knives, like a collector car that is so rare and worth so much, they will never be driven. These types of knives will never be used. Two of my examples of these knives are as follows:
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Above, is a knife Gerber made for the White Stag Manufacturing Co. of Portland, Oregon in 1969. This knife is number 9 by the serial number. I have the box it was sold in. The advertisement shows knife number 2. It is unknown how many of these were made, but very few examples still exist. It will never be used.
The second category:
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In the mid 1980's, Gerber made 25 special Mark II / Mark I ivory handled knife sets. The serialized sets were intended to be gifted to Gerber Executives prior to the 1986 Fiskars take-over. Very much a work of art, and rare, so they will never be used.