Edit: so it turns out that every hobby can be expensive if you do it long enough.
Also I love how you talk about your hobby as some addicts.
I will buy a Ubiquiti edge router to move away from the consumer grade network gear, turned into just one more $500 server to complete my homelab cluster. Oh who am I kidding the homelab is never “complete”.
Mechanical keyboards. I have a collection of 5 totalling to way more than anybody would expect keyboards to cost.
Gaming consoles and all of the parts for fixing and modding them. Got an OG Xbox that crashed, so I bought new caps, then I needed a soldering iron, then I got an Xbox 360 so I needed a modchip and a flasher as well as a 4TB harddrive and then I got a FAT PS3 with broken SMD caps so I needed a preheater and a hot air station and then I needed to get all of these controllers which are worn out so I needed potentiometers, thumbsticks…
I do play my PS2, PS3, Xbox, 360, One etc. all the time (they don’t just sit in my room to look pretty) but yeah, I 've probably sunk thousands of euros into maintaining them. 😅
I use the equipment to repair other things I get for free or very cheap, so it’s not just a money sink…or at least that’s how I rationalize my hobby. Repaired a Nikon camera with it…then I bought lenses…just another rabbithole!
3D printing. Purchased a cheap 3D printer to save money printing things instead of buying things. 5 printer print farm later, no idea why I’m doing this to myself.
I started gaming back in 90’s and here it was just buy a game and you got i all. Then I got to pc gaming and watercooling, in the 00-10, And then something happend in these Decades becous what I used to pay fore a full pc with high end components and watercooling is the damn price fore the RAM.