In reference to your "Las Vegas show" observation, could it be that more people travel to Vegas than New York and that many are exposed to the shows there? It is the number one adult destination in the US. Also, Las Vegas tends to be glittzy and the on board shows resemble this glitz as well. New York has not added any new theaters to speak of, but the hotels being built in Las Vegas, all have ellaborate show rooms. By the availability to sheer numbers alone, this nomenclature is begining to appear in entertainment venues eveywhere.