Latterly commercial concert style clubs were able to be a bit more picky and booked more trusted acts that were gaining popularity for what they did" quote
I would query your wording "more trusted acts", or those acts that they hyped up and promoted and on their books thus they became popular because they had commercial possibilities, not necessarily the most interesting or most competent musically, but were more appealing because they were closer to popular music and thus most commercial. the pursuit of commercialism can take the music further from its Roots