She pretty much has a "whatevz" attitude about my bass stuff. I am much more concerned with how much I spend on gear than she is. That being said, we have a hard and fast rule. Other than groceries, neither of us will spend more than $100 without telling the other first. But it's not like asking for permission. It's more informing the other and not hiding things from each other.
we have the same rule. it's a good one i think.