I generally donate or give away things I don’t need, so no selling anywhere, so speaking from a buyer’s perspective. I would be OK with mid-tier designer stuff like Kate Spade clothes or TB flats off Poshmark but would never touch any luxury items. Too much fakery… ditto Tradesy. Or whatever it is called. If I had a Chanel bag to sell, I would sell it on RealReal, Fashionphile, or Yoogi’s.