I've never watched the show. It would cut too close to home.
My mom is a hoarder.
Less bad now, but growing up, she found it nearly impossible to throw away anything. She had completely irrational ideas that pretty much everything had a potential use. If we were living in a post-apocalyptic society, it might have made sense, but in the context of normal life, it's nuts. We kept everything: food jars, newspapers, everything.
Not content with our own stuff, she also constantly had us scrounging through trash to find "useful" stuff. Our home was filled to the ceiling with boxes of stuff.
We were poor for a long time, but when we finally had some money, it got worse. We were able to buy a house, and my mom was able to buy stuff to fill it with. She was too frugal to buy clothing, so she bought cloth and sheets. (The idea being that she would sew it into clothing.) We had thousands (not an exaggeration) of sheets and bolts of cloth. She went nuts at stores like Tuesday Morning, and we had 30+ sets of dishes. When I left home at 18, my mom had 2 houses, both filled with stuff.
It's a strange malady, and I assume that a lot of is due to living poor for so long (we were pretty impoverished for a long time, including a period of homelessness,) coupled with some sort of clinical psychosis.
I tried to help her on numerous occasions, but she wigged out if I threw anything away.
It's better now, because she's too old to really do too much hoarding. She's also a bit more open to help. I've got all of her stuff moved into several big trailers. It makes her happy to know she's got it, and it cleared out her home so she has room to live.