The bottom line is that collecting dolls is a hobby, and almost any hobby is a "waste" of money in the sense that you're spending it on things that are not necessary for survival. The point of a hobby is to lead a fuller and more interesting life, and the creativity involved in doll hobbies is certainly an example of that. When the money collectors spend on dolls is questioned, I generally just point out that it's not so different than any other leisure activity and we all have different tastes. That said, it's a little different when you're younger and still have parental involvement with your finances. I don't know who is paying for your education and it's really none of my business, but I can see why your mom might be concerned about your ability to make ends meet if she sees a lot of money going out for hobbies at this particular time in your life. It might be a good idea to reassure her that your bills are getting paid and to show her that you are saving some of your money for the future as well as spending some of it on hobbies. It seems like your mom may be worried about you more than judgmental, so I think that setting her mind at ease that you're doing okay overall financially might make her worry about the dolls less.