The trouble is, if you post salary range from X to Y, most candidates will expect getting Y and will be permanently unhappy with their new position if they get

The trouble is, if you post salary range from X to Y, most candidates will expect getting Y and will be permanently unhappy with their new position if they get closer to X. It is simple psychology. Then what about the candidates that are so good that you want to pay them more? I fully expect that best candidates will still be able to negotiate better than the official salary range.