I don't know, but if a band ask me to not take any photos I usually respect them enough to not to take any pictures? It's like that with everything.. If someones ask not to, why do it? I would've understand if they didn't say anything and then got upset that people were taking photos but if they actually ask not to.. Then I don't see the problem. I don't think they try to enforce anything... And well, I'd like to be kind to the bands I like, especially if they do a oversea tour since everyone can't go to Japan and see them. And if the band suddenly decides to stop touring because fans can't listen or respect them - then you've destroyed for other fans. Maybe your actions doesn't effect you as much and maybe you think that the band are idiots for being so sensitive, but it effects other fans and I don't see why that would be worth it.
And not doing favors by doing live shows? I think it depends who you ask, for some music is very ver very very important and I, personally feel happy when I've the chance to see my favorite band and I am always thankful if the band decides to come to my country /or in this case near my country. If they want to play the music I like, then I can respect them enough not to force a camera up their faces and take unflattering pictures and spreading them online to laugh at - like some people do.