You should set a rule that if it isn't used yearly it goes. In the case of the ice cream maker that means you have to make ice cream once a year just so you can keep the machine.

I don't follow the above like a religion, but it is good advice. I have a collection of things my grandma made that I look at once a year just because having it gives me joy and that once a year rule means I have to look at it or get rid of it. (I don't know how to explain to my kids why they give me joy - she died long before they were born so they have no memories of her hobbies)