not really. A quick search shows that a few years ago the CS5i were going for only under 4k bucks which would also be negotiable.
https://forum.polkaudio.com/discussion/169027/fs-thiel-cs5i-speakers
There are plenty of big heavy objects you can buy that cost very little. Bricks, concrete, cast marble etc. Aluminium has a nice finish so that is another reason it is used. There is no proof that the Magico method works or that it cant be done more cheaply.
You could mount your drivers in the wall at a fraction of the cost and it would be far more inert.
https://forum.polkaudio.com/discussion/169027/fs-thiel-cs5i-speakers
There are plenty of big heavy objects you can buy that cost very little. Bricks, concrete, cast marble etc. Aluminium has a nice finish so that is another reason it is used. There is no proof that the Magico method works or that it cant be done more cheaply.
You could mount your drivers in the wall at a fraction of the cost and it would be far more inert.