A couple of years ago I was at an Asian Dub Foundation concert and at the end they played a fresh new song to the point the singer had the lyrics pulled up in his phone and rapped from that, because he wasn't sure he'd not mess it up.
I love that. I get a huge dopamine hit from the novelty of seeing a new (or rare) song performed…but then I tend to obsess on a few acts rather than having a lot of bands I might go see.
I like that a lot. Don't know if it was a expensive concert but I like going to shows where the ticket price is cheap, and the musicians tell people it's a work in progress.