What's wrong with lipsynched!?

i was watching some old performance of ITNW on youtube...
and stumbled on a few comment(s) about they did not sing live...

so what's wrong with it if SNSD lipsynched?
no harm was done to you anyway...

think twice...no...millions if you must...
which girl group...or boy group...that has never lipsynched?
how could they sing for an intense dance routine without sounding out of breathe?

and stop showering with facts that WG always sings live...
their dance routines was never intense to begin with...all of them!
(but they did lipsynched sometimes)
2NE1?
lot's and lots of techno,electro...whatever it was...it's never really their own voice...

and about SNSD...
so far they are the most successful girl group to date...
nobody can deny it...
live or lipsynched...
they are getting more love and will grow with time...