Au contraire!
99.9% of all the folk acts I have seen (in the midwest)have been excellent. (The 0.1% was a person who plays autoharp and failed to notify me on the day of a concert that he had laryngitis and could not sing. (This I found out 30 minutes before the concert). We were treated to 90 minutes of autoharp tunes (with two attempts at croaking vocals). It was awful, but he still walked out with all of the money. He won't be booked by us again!
I recommend to all bookers some of these lesser-known acts from the mid-west.
http://www.kateggleston.com/      
http://www.ljbooth.com/
http://www.smallpotatoesmusic.com/