most bands have their friends taking photos for them, and most probably they'd have seen it already.
if you were there or if you attend any shows, you'd realize there will always be an abundance of gig photographers there.
so why not share the pics? most of them get good shots cos they tend to be in front with their big ass cameras.
its not that hard to aint it?
and if the photographers are scared of sharing or being ripped off, they can always watermark or indicate their names on every photo they take.
chill