Yesterday I've learned about a fascinating (and really depressing) psychological phenomenon which is called "compulsive hoarding". The Russian article about this phenomenon is called "Патологическое накопительство".
The thing is that, however, for the term hoarder (that is, a person with such disorder) it's more difficult to find exact Russian counterpart. For instance, Плюшкин is more close to just unsystematic collector, and "барахольщик" is also something yet related though quite different.
My question would be - what is the closest term to English hoarder we can come with in Russian?