Why do people collect things?

i think it could be a combo of everything..maybe hoping to increase value in the future for sale even ..i collect gorillas and hedgehog stuffed animals they have no value to anyone but me ..they just make me feel good when i see them ..sometimes i think of getting rid of them cause they take up room but i just cant force myself to cause i would actually miss my little finds ..and has started to be a nice trip for my husband and i when we go looking to see which one of us can find the sweetest or wildest one :)