I will never understand hoarders.
I purge all the time. I hate clutter.
There are actually two different types of hoarding, one is not even considered a type of hoarding (except on TV).
By definition, hoarding is a behavior of intentional (if even dysfunctional) acquisition/collecting/stockpiling. e.g. people who survived war or some other traumatic experience that caused them to develop a fear of starvation might collect a ridiculous cache of non-perishable foods and canned goods. This fear can even be passed on/instilled into children of the affected person, who did not themselves experience the traumatic event. They are deliberately acquiring/collecting/stockpiling particular items/goods because of some perceived scarcity/value/necessity, or fear of some future instability/chaos that will cause the items/goods to become scarce/valuable.
The other type of 'hoarding' (which is not even hoarding) is not an intentional acquisition/collecting/stockpiling behavior. These people don't acquire or collect anything in particular, nor do they acquire/collect things at unusual rates. They are just so fucking sick, depressed, or mentally ill that they cease to function in substantial ways, cannot or do not clean their homes or take-out the trash, and let EVERYTHING pile-up. On some level or another, they have just GIVEN UP on life.
The classic hoarder can have an immense amount of goods which are likely to be well organized or orderly (even if the sheer size/amount is imposing or restricting). The 'other' type of hoarder is NEVER neat or organized because they have just shut-down and ceased to function on some level or another.