Surely agents promote commercial acts. They are not running a charitable organisation. It is all about bums on seats, nothing more nothing less.
No audience, no dinaro. It is all about entertainment(talent), in this case a small niche in the entire spectrum.
Those with talent and ambition thrive, others do not. The agents grease the wheels of the process and speed the road to stardom.
The vast majority will listen to music/songs that appeal to then whether it be dylan, one direction, or Ewan MacColl. It is a tiny tiny minority that wish to strip the carcase and divinate with the bones of a restricted genre.