It's your knife to do with as you want. But consider this: Say you decide to keep it in mint condition, so you avoid using it. Not to get morbid, but when it's your time, you cannot take it with you. Then like your other belongings, your knife will be sorted through by your descendants, or whoever that task falls on. Most likely, that knife will end up with someone who uses it or just sells it off to some unknown person. Maybe they won't care for it like you do and it ends up in some garage, toolbox or storage facility. Maybe it will end up with some kid who throws it at trees.
OTOH, if you use it for yourself, you will probably end up getting much more life and enjoyment out of it than by fretting over its cost or its rarety.
Just a thought.
Jim