Festivals have become increasingly scarce as it gets more difficult to have one. A big portion of your ticket price goes to paying for your own police harassment, which is especially pertinent for Burning Man where many of the activities that long-time Burners speak of nostalgically can often now lead to arrest, and authorities won't let the festival occur without a significant police presence.
I know it's trendy to claim that events have become passe, but Burning Man seems like the poster child for that.
One of my friends who used to attend every year stopped for another reason, though; it got to feeling like fiddling while Rome burns, but it's the world burning instead. Being part of an event where people expend a ton of energy and therefore emit a ton of pollution to get into a place where nobody can reasonably live in order to set things on fire was just too ironic. She thinks that instead of one big Burning Man, it should be a series of Growing Women. Instead of burning trash in the desert and making the world worse, it should be bioremediation and making the world better.
Yeah, I know. Hard sell. But paying for police to suck the fun out of an already expensive event? Hard pass.