Oh boy, where do I even start. I guess we should first have a minute of silence for my wallet...
Fixing old computers
In high school, I agreed to take the decommisioned PCs home. They were in various states of not working, I diagnosed the problems, bought parts, upgraded and fixed them all. I now had a ton of relatively old but reliable computers. What's the logical next step?
Home server room (homelab).
I live in a flat with a giant basement, so it's full of these old PCs and servers. I needed a server rack, switches, cabling, the whole nine yards.
Photography
New lenses and filters constantly bought. Sometimes a new camera body. This is my most expensive hobby by far, but I take care of the lenses so they at least hold value, unlike the PCs :)
+1 for photography it's addicting to buy new gear lol
I started with a relatively cheap Lumix g95 ($700) m43 camera thinking it would have everything I need. But for video I wanted slow mo. It had slow mo but the bit rate was horrendous. At the time I had no idea and none of the information online told you this at all. It was just a check mark ✓ High Frame rate and I had no idea how important bit rate was. Bought better lenses (approx 1200$) because I wanted depth of field and lower light performance. Which m43 just couldn't provide, but I really wouldn't have known how much it couldn't provide it. I trudged on.
Upgraded to GH5 (800$ on offer up), same lenses but much better sensor, higher frame rates, 4k support, better video codex's. Still had issues with low light and depth of field. Oh yeah and to top it off all Lumix cameras have terrible auto focus. Which is only amplified by my yearning to have lower depth of field, cause more of the picture is out of focus. Now I want to pull the cord and buy a full frame sony camera (2500$ + another $2500 in lenses). I still think GH5 is a great camera and got good use out of it
I have a collection of various Zeiss lenses, because my proffesional photographer friend told me he enjoys them. They're amazing, but I refuse to even share how much I paid for them, since I'd probably cry :D I also have a few from various brands like Canon, Sigma, etc.
In terms of cameras, I always bought a new one, used it for a while, sold it and bought a new one. I settled on the Canon 1DX Mark III in the end, I think I'll use this one until it dies.
That basement full of old pcs and servers... Checked some models against ebay?
I bought a pallet of "computers" from a local agricultural auction for £1 based on nothing but that one word description. Turns out one was a fully working PS/2 with monitor and keyboard. The keyboard alone sold for £80, and I made over £200 on the lot and got some great messages from the buyers who were really pleased to find one.
I never did, really. I don't have anything special in there, just some Dell Optiplexes and HP stuff... I wanted to sell them but once I found out I'd maybe get 20€ a piece, I decided to keep them and try out new software on them, use them for parts, etc.