Well seeing that your wife has no clue as to your shops worth...Might I make a suggestion that you give it or will it to some "up-start" that you see as having great promiss as an artisan or craftmen/woman. A talented person who has the will and drive to go into the leather business but because of funds could never afford to build up a tool collection.
Take me for example. I do leather as a hobbie for personal reasons...gifts and just cause I want too. I have never charged for other than the kit or belt blank. Sometimes I get a few bucks but that's it. I buy my tools simply for the design and totaly balk at the idea of any stamping tool over $10.00 . Yes as a professional hair designer I won't blink an eye at forking over $700 for a pair of shears to cut hair with. $200 for a flat iron or other hot tool. This month alone I have spent right at $2,000.00 in classes. I know that when I decide to retire that my collection of shears and razors will be given to some young hot shot that I see the burn and desire in. Who knows...maybe when I retire I'll set myself up doing leather and hit all the trade day and craft fairs and end up buying some of those $$$ stamping tools!
Just an idea and my 2 cents worth.
Kev