They might come to Christ quicker some other way. The whole evangelistic outreach and ministry of some musical groups could be overrated, but I could be wrong. People should understand where bands are coming from. Also, there are dangers like drugs. People get victimized and become a ride for other artists to get to the next step.
Bands feel like they're conquering, and it becomes a dangerous lifestyle.
Christian bands can be in the world, but they have to draw a line. People listening to Christian radio for long hours want to hear God's word more than other things in everyday life, and they might not be able to attend a church service. I'm really grateful for the minor revolution in the worship experience of most Christians. The industry makes it easier for people who want to listen to music that has a Christian perspective. I don't need to see an artist's face on a T-shirt even if a scripture is attached.