If you've been following a relatively obscure band and they start to become popular, do you tend to lose interest at some point? Is mainstream appeal a turn off when it comes to music?
That's not really how it works with me - my liking of a band tends to be proportional to how little I'd heard of them before I started listening to them, even if I hear about them a lot more later. (Of course, there are other factors, like the kind of music they play, etc. as well.)