Thank you to all who took the time to respond and helped to make this a great discussion. It is interesting to read the different view points and the rationale behind them. There is of course the consistent theme amongst all replies, which is the only real answer I could expect - that this is truly one's own decision.
As for the comparison to a rare or collectable firearm, I must agree with HumbleRodent in that it's not a fair comparison. Sure there different degrees to which a firearm can be put through its paces, but not to the same extent as a knife. On the extreme end both could be used for field/survival use, however, I can't think of what would be the firearm's comparable activity to a knife being carried in the pocket and opening a letter or two.
I'd compared it to driving a vintage Ferarri above and think that is much more applicable. While it would likely never be taken to the track or hot-rodded through the streets, it could still be enjoyed if given the respect it deserves. It would, I suppose, ultimately come down to the owner's ability to replace whatever the rare item is. For instance, I would never drive around a Bugatti Veyron, but have seen people park them on the side of the road with no thought or worry of the crowds that inevitably surround them. I've also seen a youtube video showing an owner (allegedly) carelessly talking on his phone as he drives it off the road and into a lake. Neither owner would have too much trouble getting a replacement.
Back to knives, I've now got a phenomenal numbered BG42 mnandi sitting comfortably in my drawer at home. I went back and forth with the decision to carry/not to carry several times before receiving the knife, and then went through the process again after opening the box and handling it. I was surprised to find how different it felt than my other two. It seems to have a bit more weight in the pivot making it feel more sturdy. Also, the dark scales and smaller CR insription on the pivot gives it a very understated and attractive look. It would be a great EDC, but one I would always be slightly timid with and that's not what I'm looking for right now. I'll hang on to it for a little longer in case I change my mind once again, but being in the camp with many here who do not really want a knife that won't be used, it will likely find a new home sometime in the future.