Some of its demographics.

Young people who don't know much about who they are listening to, or even what they are listening to are more likely to fork over hard earned cash for something that sounds like it will be good.

Older more seasoned veterans want to hear people at the top of their game delivering the goods.

The old rave lineups were classic for that.
"Everyone B2B with Everyone. Just look at that lineup! Its TWICE as good!"
Didn't do much for the music, but made the night seem better to people who didn't know any better.