Data hoarders. I'm in a plex group on fb and there's people there with libraries that they could never personally watch all of. It sometimes seems like it's more a game of collecting all the things than it is about actually enjoying the collection.

Another part of it is the ability to play with enterprise hardware. That level of hardware has so many features which is cool for the technically inclined, but useless for a normal home user. When enthusiasm hits resources and the desire to acquire knowledge, this happens sometimes.

I have seen a couple of guys who acquired older generation storage "racks" which they "play with" in the weekends. Do they have the cooling? No. Does it affect their electricity bill? Very. But they want to learn that thing and want to play with it, which is understandable, as long as it's kept checked.

Not different from audiophiles who lose their way, actually.

I was a wannabe data-hoarder by accident, but I understood why I'm doing and decided to slim down drastically. I'm merging, deduplicating and deleting data step by step, because many of it is my own files from the days of yore, and I want to preserve some of them. To be frank, at this very moment I'm verifying that I have copied a bunch of files without corruption, so I can start working on them (sha256deep is an underappreciated tool).

Some of the datahoarders give me weird looks when I say, I'd rather have a single NUC with a couple of spinning drives for backing up what I care rather than having them all in a cabinet full of RAID arrays, but I already have them at work. I don't want another server at home (not because that I don't enjoy it, but I want to have some time touching actual grass).

This is correct, I personally aim to have all the highest quality versions of all movies, ie original Blu-ray. I have plenty of people that make use of it, it’s a hobby.

how much does it cost in term of electricity per month?

Either that or they share their library with others (or maybe a bit of both)