Registration for the annual E3 video game industry expo in Los Angeles opened Monday, though registrants were surprised to see expo passes priced double what they were last year.Three-day show floor Expo Passes are priced at $795 if registered before April 23, 2012, and are $995 afterward.By comparison, prices during 2010 were $400 and $500, respectively.As always, qualified industry professionals may register for a complimentary Industry Pass, though the dramatic price hike for Expo Passes may keep smaller developers and interested outsiders at bay.E3 is an annual video game industry event that exhibits new products to analysts, reporters and industry professionals. It has been the premiere event for announcing major products and initiatives since its debut in 1995.Registration is open now at the expo's website