Why do we as humans have more "stuff" than we actually need?

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"I can't throw that away, I might need it someday!"

I am going through a mega decluttering process.  If I have not needed it in X years, and it is taking up space that would best be used to be occupied by something else... then I am getting rid of it.

I somehow ended up with four of the same wood polishing spray.  I am giving away three to my friends and keeping one, because I only need one for the next few years that it will last me.  Keeping the other three just takes up too much space in the area under the sink that I have not decluttered in years.