Of course it was going to get spoiled once people learned that you can find drugs and naked women there! There's nothing surprising here.
Once a cultural happening becomes mainstream, the original supporters feel like their little secret is out of the bag. It isn't fun or "special" anymore.
That is true, but there is also a mini-backlash against all the disillusionment: i.e., the Burn is what it is. There are some artists who have been in it from the beginning, and there are more and more newcomers, but so what? Of course it has changed, since it’s not centrally, bureaucratically, rigidly controlled. Those who don’t enjoy themselves any more will decide not to return.