I make considerably more than my wife. Do I let her tell me how to spend my money? HELL, YES! OF COURSE I DO!!!
Why? I am really crappy with money. One of my wife's many fields of expertise is accountancy. (She has multiple degrees, one of which is accountancy)
So she tells me how to spend my money. Because I ask her to.
Why? Well, we are married, and it is not my income, it is our income, from the way I see things.
She sometimes asks me if she should spend money on herself. I always say yes, as she is not keen on spending on herself.