A thousand Dollars for a folder?
There are plenty of high quality usable knives from premium makers fore less than a grand. I would have a hard time using a thousand dollar knife the way I do my EDC or any other user in my knife box.
Pocket knives? I really don't know if I'd want a thousand dollar pocket knife. It would be easy to get to a grand with one of the gentleman's gems from William Henry knives, but they are too small for my liking. Perhaps a CRK Sebenza converted to automatic. Might bump the upper limit there. Maybe one of the Darrel Ralph Madd Max folding daggers. I'd prefer one of the originals, but a current production automatic would be nice (but not an EDC).
And so, at $1,000 I would be looking for fixed blade that is a closet-queen. . . .one that I would expect to appreciate in value. That price point is a little low for an investment quality knife, but that would be my first thought.
I am not sure about this, so research would be necessary. . . .I am thinking Randall Made might be one option. One could option the heck out of one of their offerings, pay for it and wait out the 4-5 year delivery time (is it six long years now?). The result would be a factory sealed, "New in Box, MINT" knife that has never seen the light of day, never handled etc with factory edge . . .you get the picture.
That is one thought. Another path might be looking for one of the discontinued Cheis Reeve one-piece knives. They seem to hold value, but $1K might not be enough.
A custom knife would be another way to go. Again, research on who to engage and what is trendy vs what is a lasting value in collectable world would be in order. I have never gone this way and so don't really have a good handle on it.
But there are plenty of high quality knives for daily carry and daily use that come in at well below the kilo-dollar price point, so an attempt at investing would be my way to spend thousand USD in a knife.