I went to both shows last year, yes it could be 1 big show and it would most likely cut down on the ticket price having it under 1 roof. Regardless the December show had a lot less product, but far better deals than the airport show. I waited for the airport show for a new jacket and they were pretty much retail, was cheaper online. I did purchase my helmet on the last day of the December show for 80% off. still cant get it that cheap!
and bikes were way cheaper at the December show, plus you could sit on them and test them out. I did attempt to fire up the ducati as the keys were in it, but got shut down pretty quickly!