If you look around, you will notice that only men will love to collect coins/ banknotes as a hobby. Women usually are not interested. They may accompanied their husband, boyfriends to coin and banknotes show, dressed and looking attractive. They may asked the value of the banknotes when their men are seriously considering to purchase the note. If the value is on the high side, they will exclaimed. Wow...are you going to buy that ? Dear, it is expensive. The men will have to explain why it is a good piece whether it is going to be for one's collecton or investment.
It's true even in South-East Asia ( where I came from ). Coins and banknote collecting are mostly male dominated hobby.
Luckily, my wife is supportive over my hobby but she is not overly interested. She sometimes get excited whenever I purchased something new and whenever I sold my earlier pieces. . She will always ask this question. Do you really have to sell this nice old piece which you have kept for so many years ? Why not keep it for our son and daughter ? I will always answer her. It's not part of the collection and moreover collection direction changes as we move on with our hobby