I came across a few JW hoarders can't speak for every JW as you don't get to see how every JW lives and what's in their closets, although, what made JW hoarders different to the usual mountains-of-crap extreme hoarders you see on those shows they were neat, clean mountains-of-crap.
OCD in some or another was rife. One could argue that being a JW itself is a form of OCD. Not surprising really, all those culty non-sensical rules do your head in if you take them seriously enough. Every Jdud I ever met was "thingy" about something.