Not really the point, the issue is no top club has ever put a serious bid in for him. The closest that he has ever got was Arsenal sniffing around him before they signed Pepe. I can't recall any of the big clubs in the PL or Europe showing an interest in him like Sancho, Hudson Odoi or Sane. You could argue that Palace put a prohibitive price on him, but in the last 12-18 months they have let it be known that he was available.
Strange that no team has bitten at the very least he contributes at a squad level.