JMO----
Your guns in your safe/safes are a very sound investment if even periododically checked on)
Sit down with the wife(now)and maybe the older kid/kids(in case somthing happens to you both) and go over their present condition/current value(as of right now)Dont "wait" or it wont ever get done!
I dont give a hoot what you paid for them 10/20/30/40 years ago.(Guns kept in good shape go up in value)
Write down in a notebook/and maybe record it on DVD or video on a Digital camera memory card so she wont forget later right now in case a truck runs over you tomorrow.(my wife/daughter know mine right now) Use the current year Gun Trader Pricing book along with using a site like Gun Broker and look at a bunch of similar shape models and what they are selling (sold)for as of right now and that date if that selling time ever comes.Heck ask on here also cause most of the people on here have good input and that can aid in this.
Myself, unless its maybe---Hobie, or my immediate family member/best friend owns a gun shop going to a gun shop asking their values(nope)Also trying to put a percentage additive to their price with time(Nope)
Also, show her how to wipe down/lube the guns and run a oiled cleaning patch down the bores.
Women are smart and once you show/explain have them do it(no problem) Mine do!
Tell the wife that after your death to (wait)dont sell anything for a very good while cause she might wish she hadnt later.Also tell your wife if somthing happened to you and she remarries the guns are for the KIDS when the time comes not new Bo if she remarried (but thats just me though,so whatever with that one)?
Not that then I can do anything about it(maybe though, we dont know)? But Bubba, he can go buy his own
In my house I have told my wife/daughter my wish would be (dont sell none)
They know how to shoot/clean them/as of right now and I have instructed them how to get their value with the passing of time as it goes by, along with all the ones that have special family history behind them.(all of them

)
I would like to see after me and then the wife are gone/the daughter has them all and keeps it going down that chain through the generations.(funny, she does keep saying Dad,when you going to croke so I can get them HBARS and M1's)
Selling the guns for some cash in my household would indeed be a very sad day!
Would be better to have that extra amount if need be added to a life insurance policy or somthing?
Thats just me, but everyone has their own reasons!
My wish is to have my great/great/great etc. grand children owning all my guns and know all the stories past/present/future behind them all.