O RLY? Nobody said it should be like your example. There are ways to show audience that you care without sounding like a bunch of pricks. It felt like they just working for money, you know. I payed $100 for a ticket (as about 2000 more people did here) and I don't even know that they are WANT to play that gig. Not cool. Afore mentioned Converge, for example, chilled with the audience and REFUSED to leave the venue after the show until the very last person left. DEP? Same thing. Faith No More? Patton was asking questions and giving his mic to people in front row to answer. And the list goes on
I live in a country where 90% of music is pirated and still I have bought all of their albums and couple of vinyls. And I certainly don't like them to act like it's NOT important and they don't care.