What's the use of a 192 kHz sample rate?

Hi:

Why does DVD-Audio use 192 kHz sample rate? What's the advantage over 
44.1 kHz? Humans can't hear the full range of a 192 kHz sample rate?

On average, what is the minimum sample rate for a guy in his early to 
mid 20s who likes treble?

I agree there are a small percentage of humans who can hear above 20 
kHz. However, DVD-audio uses a sample-rate of 192 kHz which allows a 
maximum frequency of 96 kHz. There is no known case of any human being 
able to hear sounds nearly as high as 96 kHz. I can agree with 48 kHz 
sample rate and even 96 kHz sample-rate [maybe], but 192 kHz is just
stupid.

So whats the justification fur using 192 kHz? If you ask me, its just a 
total waste of bandwidth and energy. Any proof to the contrary?

Please correct me if I'm wrong but AFAIK, its a waste of time, money, 
energy to move to 192 kHz.


Thanks,

Radium