Simplicity

This is a question I have been pondering.
If simplicity is so simple, why is it so difficult to attain?
You hear a great deal about "simplify your life" or "simplify your work environment."
What is it about needing all that "stuff" and conflict and complications that it usually brings that is inherent in the human psyche? Where do we learn this need for stuff? Society? Family? Cosmopolitan magazine? What is all this stuff supposed to do for us other than complicate our lives? How does it creep up on us the way it does?

I am one of those people who hates clutter and loathes disorganization. I am the type that keeps the garbage bag in the closet to throw items into to expedite their transition from my space to the Salvation Army.
Amazingly, there is always stuff to go into that bag. Wow. Where does it all come from? Was it para-matter that has changed back into stuff of this dimension?
Truly amazing. Any ideas??