Hi Riad. I don't think that carrying and light use harms the investment that much. Bose knives (and many others) go for such a premium over makers price that you might not get maximum value out of it, but you will probably never lose money. And you've had the joy of carrying and using it. With a slipjoint, as long as you keep it clean so the blade slots dosnt rust, and you dont nick the blade too bad, anything else can be restored to almost new condition. So, you carry it for a year or so, til you find a different knife to carry, have the knife touched up by the maker, and put it away. Ironically, some of the most rugged custom tactical knives, designed and built for hard use, lose significant collector value/interest if they have even the smallest scratch on them.
The other thing I do is carry the knife in a Den's pouch. Leather on the outside, fabric on the inside, velcro, molds to the knife. Keeps it clean and away from coins, keys etc. Tony and Reese and their toadies frown on pouches and give me grief to no end about it. To paraphrase Tony, "Its a pocket knive, not a pouch knife."