To say Burning Man is a bunch pot-smoking, naked hippies is unfair. A more acurate desciption is:
A group of young bored teenagers, and a group of clueless, irresponsible and tragically unhip 20-somethings brought together by a lack of culture so deep they've donned the cultural tendencies of "Hippies". Or at least what they understand to be hippies by watching TV and movies, or reading the same LCD-laced pamplets and novels passed around for generations.
They gather each year for a big f-ing party, presented under the guise of some vague, political and/or enviromental agenda, which is rarely addressed. Money is gathered for the cause all over the world but is simply used to fund the next year's party.