James Tanner of Bryston said that black sells more in 2 channel, and silver sells more in home theater. He didn't know why, but that's what his sales figures were.
I had a black faceplate on my Bryston B60. Recently moved and my system is in the living room, in a cabinet with all silver/sliverish stuff - cable box, XBox, and Apple TV. Changed the B60's faceplate to silver and it looks a lot better.
I use to like black, but I guess I'm going through a silver phase. Now my DAC sticks out like a sore thumb being the only black component in the cabinet.