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.
Would you mind telling us more about your exotic industrial camera and how you managed to salvage it? I love learning more about topics like this.
There’s a whole class of cameras called “machine vision cameras” - a DSLR-quality sensor in a box with no user interface, intended to be embedded in a machine. Factory automation, scanning cinema film, hunter-killer robots, etc. The one I have has a 35mm sensor and an f-mount adaptor, so it’s compatible with old manual Nikon lenses. (Nikon lenses were really popular in scientific and industrial applications all thought the 70s/80s/90s. Probably not so much now.)
My blog post about it:
https://www.cca.org/blog/20201111-Machine-Vision-Camera.shtml