I don't tell my wife about new knife purchases, but I don't make a point of showing them to her either. If she asks, I tell her anything she wants to know. The only way to keep a good marriage good is by being 100% honest with your wife. That doesn't mean advertising everything you do that she might not approve of, but it does mean telling her the truth if she asks. My wife doesn't think I need so many knives, and I don't think she needs 17 purses, 31 pairs of shoes, 11 drop spindles, and god knows how many pounds of yarn/spinning fiber. We understand each other. I pay the bills in our household, and sometimes I am the one that sees where she spent a pile on something I don't see a need for lol, but I just let her know I saw it and let it go at that, head in to my stock, and get another knife for myself.