And in most cases you pay for a unique concert, sure it's the same songs as the last show but musicians rarely play the music exactly the same way. The best concert include a lot more than just playing the songs. It's worth paying for. The best concert artist put on an act and improvise on stage. It's not easy and it takes talent and work.
This is of course an opinion (one I generally share).
Generally the more niche something is the less fans it will have but the more those fans will love it.
A lot of pop music and modern moves + video games are designed specifically to appeal a bit to a large number of people. It's almost impossible to create something that appeals a lot to everyone.
So the other option is to find a small niche following and concentrate on extracting the most amount of money from them. I imagine that without some form of copyright most of the music produced would either be stuff produced by musicians for other musicians or for the upper classes who would fund it's continued development.
