Sakahara,
I agree with your point, my bad for not providing a complete description of how wooden blocks can help - maybe I should clarify.
I suggest placing hardwood blocks under your player on top of a significant block of wood or other material that absorbs and dissipates the vibrational energy from the drive mechanism and digital boards. Brass or other stiff material works well to transfer vibration away from the player chassis, but brass footers generally cost a lot. You can purchase a thick piece of solid maple or maple or other hardwood composite chopping block and make a few wooden blocks of the proper height for well under the cost of a set of brass or other dedicated footer solutions, and I my experience is that you will get very close to the same performance in my opinion. And having brass footers alone above a glass, thin MDF or other compromised shelving will not provide adequate vibration control.
The problem with soft solutions like sorbothane is that they can help protect your drive from external vibration, but do less well at transferring internal vibrations away from the player. One solution is to have a large, thick wooden block supported above your rack by sorbothane or other flexible material, and support your player above the large block with smaller hardwood blocks, brass footers or some other hard support that will drain vibrations away from the player and into the body of the wood below.
