In the past couple of years, I’ve been pretty haphazard about obtaining new music. I used to be more of a keener. Like most people, I’d feel frustration when a band I had come to love early in their career suddenly got ‘discovered’ by the mainstream and became loved by everyone.
Over at the Good Hodgkins blog, there’s an amusing and snarky discussion of this phenomenon:
And I’m not necessarily referring to the twelve albums-a-year crowd who camps out for Rob Thomas tickets; I’m referring to anyone who goes to concerts for every reason except the music. It just seems to me that people who go to concerts for sex and drugs would be better off staying at home and masturbating to internet pornography or meeting shady characters on Adult Friend Finder (more efficient means to the same ends that don’t also involve ear damage).
There are a number of good excerptable (is that a word?) sections, such as “nobody thinks long and hard about music and what it means to them and then ultimately decides to listen to Toby Keith.”
DarrenBarefoot.com 
As I said on Good Hodgkins’s blog, while I sympathize, it’s also true that a rock show is a SHOW, meant to entertain. So bands should seek to entertain, and to bring in new fans. And if the fans they bring in aren’t the kind you like, there are a ton of great bands out there no one knows about yet that you can go support instead.
This comes from someone who once tried to make a living in an indie band, and now works part-time playing sixties covers at weddings with a wig and glittery jacket on.