I know some quasi-hoarders who are similar, too: I know a person who has 30 guitars but they're so cheap and badly maintained that they're probably less worth than a high-end one. And the "next guitar" they buy is only good for a couple days.
My buddy's dad moved his boat from the water to his driveway to do a bit of work on it. Over the course of a decade, it went from "we can probably sell this for $15k" to "we can hopefully still get $5k for the engines" to "we gotta pay somebody to haul this away now".
So yeah, they got lots of old engines lying around on display now. And a box of compasses and other crap.
Where did his money come from?
That sounds kind of cool.
But yeah, I'd still be pissed if my dad left me a mess like this to clean up. The property is nice and all, but a lot of it may need to get torn down if hoarding caused any structural damage (it can, houses aren't built to be filled to the brim with stuff), and that's not cheap work to get done up front. Probably not that easy to sell if you decide not to clean up the messes either.
It was coupled, for my dad, with extreme frugality. He seemingly willfully deprived himself (and his family) of any fun or comfort by acquiring cheap versions of everything, or rigging up odd simulacrums of things, like the whole-house "air conditioner" he made from a cleaning bucket and some coffee cans. He bought a boat, then put such an underpowered motor on it that it was a joke. We had water skis, but they were rotted and just sat sadly against the wall, unusable.
Oh, my time's up? See you next week, doctor.