Flash Mob Discount?

Flash Mob phenomenon is still going strong.  There was one planned in SF last Wednesday at a bar near O'Farrell Theater, but I couldn't make it.  Anyway, I am wondering what a Flash Mob of shoppers would be like.  It seems silly to go to all that trouble without getting a discount.  Maybe, stores will start giving out Flash Mob Discount for publicity and profit.  This could be a way to help out small local stores too.  Stores can host their own Flash Mob event too with Flash Mob Sale RSS feeds.  Cool!