RENO, Nev. - The biggest prior threats to Burning Man's annual regeneration in the Black Rock Desert were U.S. land use laws, undercover cops and the media-perpetuated perception that the largest outdoor arts festival in North America is really just an excuse to get naked and do drugs. But that was before the teeth-gnashing "ticket fiasco." Two decades after the free spirits moved their party from San Francisco's Baker Beach to a dried up ancient lake bed 120 miles north of Reno, the annual pilgrimage with its drum circles, decorated art cars, guerilla theatrics and colorful theme camps has become...