I think its all component dependent and what you are used to seeing. Certain products have certain colors, just like certain teams. Minn Vikings look way better in purple jerseys, the Cowboys look way better wearing white jerseys. Whenever you see Dallas in dark uniforms or Minn in white, you always think to yourself that they are going to lose because they are wearing the wrong jerseys.
Likewise, cj tube preamps in black, would probably sound awful. Old Yamaha analog recr's in black probably would sound awful too. Sansui AU-717 & TU717 in silver (could be cool, but that's a violation too). Spectral in black is just plain wrong...Counterpoint gave you your choice and looked good in either color, but did one color sound better than the other? Meitner in Oak - I'd bet if Mapleshade listened to Meitner amps in Oak or Maple, they would conclude that Meitners sound much better in rosewood. Motif in black just wouldn't look right either...Threshold did both black and silver and I'll bet their silver faceplactes sounded better than their black ones. Adcom in white sold for more money than Adcom in black and I believe sonically it was far superior as well just as the Vikings play better in purple than they do in white...Perreaux in black, old Hafler in silver...we could go on and on here....any other violations when it comes to team colors or component colors? The 76ers in black was another violation too...