I had a stainless steel 3 mode AAA light that I carried for many years. on my key ring. Loved it. Looked the same when I lost as when I bought it.
In general I guess I would consider myself a small time collector. Have a display area in the movie room with my nicer lights in it. A few might get used during power outages, but mostly they just sit there. Others sit in a closet, in a box. For actual use, I use my pocket light...right now that's an Olight I5R...standard thingy. I also have a cheap Ryobi 120ish lumen 18 volt light that sees a lot of use.
So my copper, brass and titanium lights...along with a few other nicer lights, no, not used. My kids will probably sell them when I'm planted in the ground (at 66 might not be that far away)...or maybe they'll hold on to them to remember how nutty I was.