Ridiculous collecting of piles of junk is a common symptom of OCD. I have OCD and overpowering urges to do that kind of thing, but fortunately I have it more under control these days - although my collection of old Tube tickets amazes all who are fortunate enough to gaze upon it. I think the secret is a sort of displacement - if I focus on collecting a single kind of crap, I can throw away things like receipts or old cinema tickets with relative ease.
I've taught myself how to do it over the years - part of the solution is to recognise when you're in a mood to throw out emotional baggage, and the stored crap associated with it. Anything I haven't used in the past two years is unlikely to be used again, so it goes either for recycling or to charity. There are exceptions, of course - my reindeer skin, pocket TV, tennis shoes and velvet coat. I *hate* small bits of paper and get rid of them ASAP.
I was once sorely tempted to put everything I owned in a large pile and cover it in paraffin and set fire to it, and then sod off to Tibet and join a monastery. Still, in my more lucid moments, this strikes me as an eternally good idea.
I've moved accomdation quite a few times in the past year this made me quickly realise that junk should be thrown away. I now can fit all my possessions in the back of my car. But as I'm looking into buying a house in the near future no doubt that my stuff will expand to fill as much space as I buy!