Yoga is more than just getting into the breath ing and a pose. It is how we intereact with our world everyday, it is the words we speak and the relationships we engage in and, yes, it is the "stuff" we surround ourselves with. We can't get away from "things", we live in a material world of "stuff". Some of it we almost need, like a bed to sleep in or a table to eat off of. Yes, perhaps we could live without these things, but it adds a level of comfort we have become accustom to. Beds are nice to sleep in and tables are nice to eat off of, there's no argument on that one.
But for the most part, we simply have too much stuff. We spend countless hours buying, organizing, and storing our stuff. One of our First World Problems is that most of us would admit that, if we had the money, we could really use a hired professional to help us wade through it all and sort it out. There's a good reason "Organizing Hacks" are going practically viral on facebook and other social media sites. We love our stuff, and better yet, we love our stuff neatly hidden and out of sight. So, why on earth do we have it in the first place when the goal is to hide it and put it somewhere else? If you don't love it, let it go. Here's an interesting post on our relationship to our things, and really worth checking out.
These are some eye-opening facts to ponder. http://www.becomingminimalist.com/clutter-stats/