The sound coming out of your loudspeaker is probably the largest source of vibration in your listening room. So why have all those sensitive electronics in the same room as the vibration source? And I know that there are some exceptions, but nearly all loudspeakers have their crossover electronics within their enclosures. There are efforts in some designs for vibration control, but isn't the interior of a loudspeaker cabinet a highly vibrant environment?
The consensus of this thread is that vibration is a horrible thing that must be combated, but a look at the system pages indicates that it is not really addressed.
In my own system I use Solid Steel and Quadrispire racks with some additional rubber and cork mats under the electronics. The electronics are in the same room as the loudspeakers. The transducers get a more elaborate setup. Nothing really expensive, but I figure it can't hurt.