Quoted from Mr_Tantrum:
I get that maybe this (pins appreciating in value) helps with the justification to your spouse.
Nope. Tried that with my wife once. Purchased TZ in great condition for $1200 in 1995 and have added ColorDMD and a few upgrades since. When I told her what it should be worth now her response was wanting me to sell it for the profit. I've never sold a pin. I buy stuff because I want to own it. If she outlives me she can sell my stuff after I'm dead. If you sell a game for a profit then you don't own it any more, and where's the fun in that?