everyone is different but I dont put any sentimental value into material goods.
At any given moment I determine if something is useful or not.
The only "sentimental" things I keep are photos. Ill take a photo of things if I want to remember them.
Photos are digital so they take no space.
This is a good mentality to have as it avoids allowing money to be stuck in unused property, or clutter to enter your home. I do feel sentimental about some objects because they serve as a pneumonic devise that stirs up memories when I handle them.
I can go a little overboard on this. For instance, I don't want to sell the first handgun I ever bought, despite not having shot it for like a year and a half. That money would be better served going into another gun I do want to shoot, or reloading equipment. However, I'm sure it'll come out to play again one day, and it serves as a backup carry gun, so I just can't force myself to ditch it.
My father is an example of extreme sentimentality. He guilt trips my siblings and I into taking old junk because he clings to the past so heavily. He once insisted that I take a hammer that was so rusted up and old, that I was afraid it would break with any use, purely because it belonged to my grandfather.
His sentimentality is pathological IMO. He keeps a deck of old playing cards that is twice as thick as it should be because the cards are beat up and bent. They belonged to my mom, who died a few years ago. He won't use them because they are so beat up, but he won't get rid of them either. In a home full of objects that would remind him of my mom, I don't understand why he insists on keeping consumable objects that should be disposed of.
As guns are a durable good that can survive years of use, I can understand why people get really attached to them.