People may disagree, but I think one of the reasons that successful people are successful is because they have LESS stuff.
Why, you ask? Because their brains are NOT operating out of some outdated primal urge... like a caveman.
During the Stone Age more stuff was good. The ONLY way to measure success or the ability to remain alive was with possessions. The more stuff you had (i.e. the more material for survival), the more successful you were likely to be. If you had a big cave filled with sticks and brontosaurus meat, that made you a big man on campus. In those days there was a logic behind holding on to possessions and things for years to come. Clutter did not exist.