If I were to make such a vow my wife would assume one of the following. He's bought another one. He's just kidding and wants two more. He's off his meds again, not a good sign.
My wife and I have no joint banking accounts. We never have conflicts over money or how it is spent. Our bills are paid, our kids and dog are spoiled. So if she wants to buy something I don't care and the same goes for me. Best thing I ever did was to not open any joint accounts. I have seen countless friends end up divorced over money, who spends it and who earns it.
