Who says they have to be convinced or like it
One day I told my husband that one of my childhood dream was to own a snake, he told me he was scared of them and did not like them but if it was what made me happy than I should get one...............than I saw the first Pied and decided since I could not afford it (10K at the time) I would make my own and that's how I started breeding.
There is no allowing the other to spend money in our house not the way it works we are equals, their is money for bills, life necessities and savings and than there is money dedicated to leisure, hobby once all bills have been paid and essentials have been bought, some of that money is spend on things we do together and some is spent on what we each like to do.
Now fast forward almost 10 years later my hobby pays for itself and generate a profit, for the rest my husband went from being scared to not liking snakes to being more educated about them, and he is ok with me having a snake room and breeding snakes and rats. We do not share this hobby it's mine alone and it's fine with me.
Relationships how about compromise and supporting one another choices.