It used to be that any new gun purchase was greeted by wife with howls of wasted money comments. Telling her that her clothes purchases did not appreciate in value just made her madder.
I finally sat down at the computer, and made up a spreadsheet showing, mfg., model, description, etc., and most important the last two columns are Cost, and Todays Value, with TOTALS. Printed it out, and gave her a copy.
She now even makes nice comments when I buy one at a below market value.
Make up a firearm spread sheet. Every gun owner/collector should have one anyway, in case you pass on, so your family dosen't sell all your guns for $50.00 each to cousin Louie, who never liked you anyway.