isolation for amp?

I was reading through one of my local forum and saw a guy buying isoacoustics orea for his hegel h160, and thought that is the stupidest thing I ever seen someone done, especially since hegel h160 already has rubber feet.

but on googling, i realise that there are many other people doing the same thing. buying extremely expensive isolation platforms for their amp. the argument is that the transformer in the amp is mechanical and therefore, requires isolation.

so am I just misinformed, or are they really stupid?