There's a lot to learn from lurking. My mother watches Tik Tok videos and doesn't post herself, but cooks more now than ever based on the ideas she sees on there. You can learn about a cultural trend, a social cause, a musician, a resource, etc. There are lurkers with agendas, sure, but many are just bored and don't take pictures of everything.
Message boards like this offer even more to learn. Many people repeat what's already been said. The lurker respects this or has nothing to say and moves on.
I don't like that Burning Man curator's quote calling their saying a form of "inclusivity" when it doesn't include the lurker. It also suggests that "being present" is necessarily not being observant, but doing things that are supposed to be done at their festival, which I don't agree with. That said, I'm sure a space like that would actively become less of what its meant to be if there were tons of people just spectating. They should own the exclusivity that they want.