Earphones at Rock Concerts for people with poor hearing

I heard this on the radio this morning. What a great idea. No more noise, instead you can get to hear the band you see in front of you. At the beginning its only for people with poor hearing (plus free parking :-?) but perhaps in future it could be available to everybody. This will start at Rock Werchter (near Tremelo) this year so hope it's a good success.