Though there is a Compulsive
Disorders expert community, it looks as though there either has been no activity, or no expert answers provided in quite some time.
Hoarding, specifically, is a perplexing subset of the anxiety and compulsive behavior spectrum. It is one that is particularly hard to treat, and has a high rate of relapse. There are many people suffering alone with this disorder, and many more whose families are devasted by it, emotionally, physically, and financially.