for a cheap experiment put some bubble wrap uner your CD player. With my ACR CD-2 there was a significant change. the sound tightened up and became quite dry. I didn't like it as much as the feet on the stand but the point is the difference is very noticable. cost of tweak if you like it...not being able to bust the bubbles on the packing wrap.
What is vibration isolation for?
Where do these vibrations come from? From where I stand the earth doesn't shake too badly?! I would think that most vibrations would come via sound transmission through the air directly through the chassis of the components thus rendering the racks or other vibration isolation, uh, useless, no? (with the exception of actual thumping from walking etc)