Most, if not all, of the rooms at the three audio shows that I have attended were set up by dealers and/or manufacturers. Most have had problems in my opinion. The gear is often quite good, but the poor sound is often blamed on "show conditions." I have come to learn that at least some of the poor sound is less than optimal set up by the sponsors of the room. Perhaps this is just my opinion.
I have only been to Axpona Atlanta since moving to the USA, and found some of the >$100K rooms an embarrasement (notable exception MLB).