The other thing that's discounted here is how people treat their products they've purchased.

I'm not saying that's the sole cause, but it surely doesn't help when filters aren't cleaned, things aren't replaced at their regular intervals, and other standard maintenance isn't done.

I'm comfortable with buying a used car given the maintenance paperwork and/or maintenance-related receipts are provided. But that's about it.

I'll probably never buy any used household appliance related to hygiene or food consumption -- washing machines, dishwashers, or even a microwave.