Taste runs in cycles, and the vintage design revival you're seeing now is just its latest turn. A generation tears out what its parents installed, calls it dated, and puts in something new. Its children grow up and hunt down the very thing that got ripped out, paying a premium to put it back.
Watching the cycle in a salvage yard
A salvage yard is where you watch this happen. Victorian ornament got stripped out wholesale by mid-century modernizers who found it fussy and dark, which is why so much of it landed in yards, and why it later turned sought-after once the people who hated it had moved on. Mid-century fixtures got pulled in their turn by owners chasing later looks, and now they're the thing a younger buyer wants most.
The cycle has a length, roughly two generations. That's about how long it takes for a style to stop feeling like a parent's house and start feeling like the past. Nothing looks worse than the recent past or better than the distant one, and a style has to cross that gap before it comes back. A yard is where things wait the gap out.
If you're buying, don't try to game the cycle. Know that today's overlooked kind of fixture may be the one buyers pay up for tomorrow, so patience pays and the contrarian does well. The fixture you love is moving through the same cycle whether you think about it or not, which is why you buy what suits your room rather than what everyone is chasing this year. A piece chosen that way still looks right after the wave has moved on.