Too Much Stuff

On my previous post, I talked about watching the video, The Story of Stuff.  It really spoke to my shameful materialistic side.  Although I am not up on the newest fashions or styles, I like things.  I like to buy cute stuff, whether I "need" it, or not. The video also pointed out the value of reusing.  Why throw something away if it is useful?
While I agree with this, and I truly believe we buy way too much stuff, when does it go too far?  I recently finished watching the first season of Hoarders on Netflix.  This spoke to my shameful difficulty in getting rid of things.  I have way too much stuff (which is why I am undergoing Project Purge) .  Although I don't have a compulsion to hoard, I understand the struggle these people go through.  I have struggled with obsessive compulsive disorder, and  I know that compulsions are incredibly hard to overcome.  Praise the Lord, God helped me overcome my sickness!  But, how does someone draw the line when it comes to hoarding?  When do you cross over from resourcefulness into hoarding?  When does it become a sickness?
I know that hoarding, like other compulsions, can stem from something biological.  I know that "stuff" is the symptom and not the problem.  But, isn't it sad that our need for things can manifest itself in such a devastating way?  Not only is it bad for the health of our earth, it is bad for our personal health.