Truly good body and paint work is an art.
I consider a really good body/paint guy/gal to be an artist, not so much a "repair person".
If you've ever attempted body and paint work (and I am pretty good at things within my skill level but nowhere near what the pro's are) you understand how difficult it can be to match that paint, or line up that fender gap just perfectly.
You find somebody that is really, really good, hold onto them like grim death because there are 99 wannabe's for every really good one. And the good ones deserve every penny. ;-)