This just sounds like hoarding, not a real problem. It's an irrational psychological attachment to things. It is a prison and a distraction from the substance of life.

Consider that it's just an ice cream maker. Few people need an ice cream maker. Few people need or even benefit from all the crap they buy in consumerist societies and pile into their houses.

You say you may want to make ice cream one day. So what? That's hardly a good basis for keeping something, especially in light of evidence to the contrary. So what if you one day want to make ice cream? So you don't make ice cream. So what Do you have to satisfy every impulse? The psycho-spiritual burden, distraction, and waste this thinking produces far outweighs some one-off use.

Maybe a friend has an ice cream maker, perhaps one he uses all the time. Ask to borrow it for those one-off cases. Or make it a social event.