PS Audio or Ayre?

Had the Ayre K5xe mp before, was trounced by a McIntosh C47. Preamps have evolved, a little bit like dacs. Even the digital volume in my old Yulong DA8 dac was better than the Ayre. The K5xe is not a bad unit, but I was loosing details ( resolution) with it, obvious difference not subtle.

I am wondering why I am constantly seeing the BHK amp and preamp for sale on Audiogon?  I am not talking about the dealers selling them, I am talking about actual owners.  If they are that good and I don't doubt it, why always for sale?

It would help to know what equipment you are using, as well as speakers.
A lot depends upon synergy.
B