People probably already said this but: If you live at home your parents are in charge. When you move from home you can do whatever you want, but be prepared to face the punch of the police if you break the law. No mother can tell you what to do and what not to do, when you've moved from home, until then, you will have to listen to her. Money is evil. I admit my greed and try to fight against it, but unfortunately there is a human thing to desire more, so it is unavoidable for me. Doesn't matter if the money I gain will be used to give to charity, I still demand that control and need of the money pile which is completley useless. I'm not a supporter of cosplays, they look nice, surely, but I'm no a person who would advise to buy one or buy one myself, for various reasons, but if I was your parent I wouldn't forbid it, I would let you have the fun. But as I said before, your mother in in charge... Not much you can do about that. Revolting will only cause more trouble