The church I used to go to had a lot of stuff like that. Not necessarily the full-on 15-minute talk with fingerpicked stuff in the background, but a lot of God-talk with soft playing in the background.
The music side of me really likes those "praise concerts", for lack of a better term, but the pragmatic side of me wonders if I'd ever go to one if I wasn't playing. I'm pretty sure the answer is 'no'. But I guess that doesn't necessarily negate the function of them, as long as it's meaningful to someone.