We bought very nice leather couches a few years back (we have dogs, leather is the only option) and paid dearly for them. And they're great. (We looked carefully at the construction details before buying.)
This summer, we had some rooms we cared a lot about and others we just needed to fill in some blanks in, and we camped Facebook Marketplace looking for stuff. Pretty soon, even the living room was getting stuff we found on Facebook, at comparable levels of quality to our old "new" furniture, and at pennies on the dollar. People are simply always getting rid of good stuff, and there isn't a meaningful secondary market for it; they're just thrilled you're getting it out of their house and getting a couple bucks in the process.
I submit that you would end up with a better-furnished room faster, more easily, and at a fraction of the cost of high-end furniture retailers simply with Facebook Marketplace and TaskRabbit (for near-instant delivery).
† Leastways, not if you live in a major North American metro.