Some things I like to keep, because I care.
For example, I still have some army uniforms from the time I served.
I have tests that I took from my time at college... There aren't many things, because if it were, it wouldn't fit in my house.
But I think it's cool to keep it. It's not a monetary value, but for me they are things with sentimental value.
What is sentimental value but memories. Do you lose your memories if the stuff isnt there?
I believe that as time goes by, we begin to lose some things no matter how much we try to "keep" them in our heads.
Do you remember the things you did when you were 6 or 10 years old?
I have few memories... Not that I should remember everything, but important and memorable things end up being forgotten.