Why do people clutter? (aka collect tons of *stuff*)
Many feel *things* make them happy (thus most of us are in debt!). Others try things (say, a stationary excercise bike) and end up not liking them/not using them and into the closet/garage they go.
Others, like me, tend to bore easily and flit from one craft/project to another so get lots of stuff to start with, do a bit then move onto the next interest.
Many folks feel safe and secure surrounded by stuff.
Others are just materialistic.

Or *hoarders*. My step moms mom was a hoarder...she kept milk jug caps, empty egg cartons, tons of otherwise useless stuff (to her...she was 70+ y/o and schizophrenic). My Grandmother in law (maternal side) still has blankets from when her kid were kids.....over 50 years old most of them are! And ratty as heck. But she thinks that if there's an emergency that the family will come to her place and she'll need the extra blankets.
Me? I like my *stuff* and I like to try new things and I do get bored easily. But now I make more informed and well thought out buying decisions. For instance, I love to sew, but not all the time. I do have a *stash* of fabric and notions but I'm not *in the mood* nor do I have the time to start doing some sewing. On the other hand, I'm about to try needle felting.

You need to remember this: Is what you plan to get/buy going to be able to be used for something else once it's initial use is expired? For example...I made a kitchen island. When it didn't work for our kitchen in this new place we're in, I took it apart and now the 2 cabinets that were the base to the island are cabinets in J's bedroom for his toys.

A shelving unit that was used at our last place to hold dvd's now holds books in our office. Our old end tables are now: #1 holding a speaker in the livingroom and #2 part of J's play kitchen in his bedroom.