Buying secondhand architectural salvage once marked you as short of money. Salvage was the material of tenements and farmhouses and anyone stretching a dollar; it meant you couldn't afford new. Two or three generations later, the same part moved into renovated houses. A salvaged marble mantel or a restored brass fixture in a renovated house now reads as money spent on purpose, chosen instead of settled for.
The part in the wall is identical either way. What changed is who bought it, and where it ended up.
From making-do to good taste
That change tracks scarcity. When solid, well-made building parts were everywhere, old ones carried no premium; new was better and newer was best. Mass production changed the equation. The cast brass fixture, the marble mantel, the complete door set became things you couldn't buy new at any price, and when fewer examples were left, the buyers with money got first pick.
The people who do the stripping have usually stood below the people who buy the results. It's hard, dirty, uncertain work, and for most of its history it paid like low work. The value a wrecker pulled out by hand was sold to people well above the man who saved it. That distance, between the person who recovers a fixture and the room it finally hangs in, is still there.
The material is real; people only started paying extra for old material a few decades ago, when scarcity and taste caught up with it. Buy the fixture because it's good and uncommon. The room, the buyer, and the price are what changed, not the brass.