I have one of the wives that encourages me to buy whatever I want, also. The last gun came out of the blue, totally unexpected, and a great deal to boot. I really had to scratch for the money. When I brought it home, I noted it would be an excellent investment, and she said, "I don't know what it is for sure, but, it is beautiful, and I think you should keep it".
I did. We've never fought about money. I get to pick the dogs, too-but I only get one at a time.
Seems fair to me.

Best,
Ted