On your first point, inclusiveness and diversity is great; the issue isn't that rich people are joining in the fun, the problem is when values get warped. What I found most striking was the paid servants and private cities described.

We can argue about what does and doesn't encompass the values of something like Burning Man, but I think that's clearly outside the spirit of the festival; and it's a festival where spirit and values are deemed important. If they wanted to get dirty, and rough it out, I don't think anyone would have a problem. It's the idea of fiefdoms forming with lords and servants, and the event turning into an expensive theme park for the rich that's so offensive.