Haha it’s the same for me with my ADHD. I have way too many hobbies and some of them are very expensive (e.g., woodworking and coffee). I found that it’s not that I lose interest in my hobbies, it’s just that as time goes on, it becomes harder to ignore inconveniences in hobbies. If I try to fix those inconveniences as much as possible and keep learning new things, I don’t really lose interest. E.g., with my current espresso basket, the fit is so poor that knocking the puck out also knocks out the basket. This minor inconvenience could lead me to quit making espresso unless I just simply get a new basket.