I've been thinking about making a post about this myself.
Here is my idea: Person A sells knife "shares" of their collection to person B.
A can use the share money for whatever they want. B then inherits the collection when A passes on.
Why this is a win/win: The knives go to someone who would appreciate them, the share seller raises funds against their collection that they can use immediately. An interesting effect is that if A uses the share money to offset the aquisition cost, they could "bootstrap" their collection to ever higher values by continuing to sell shares of their new knives.
Also interestingly one could sell/buy shares on an exchange where their values would rise and fall due to various influences kind of like the stock market.
You could also have knife "mutual funds" where several investers pooled thier money across several share sellers. There would be "fund investors" they guaged what the current and future values of collections are worht.
I think this is a cool idea, maybe I'm weird.
This could work another way. Let's say seller of shares a single knife A, decides to sell knife itself. The holder of the share for knife A could then offere to buy knife A at (price - Share price) or retrieve the price of their share when the knife was sold to someone else if the holder of the share decided not to buy it.