Well I guess it would be an opportunity to listen to gear you'll never be able to afford. And probably realise that an amp or a turntable whatever costing £50K does not sound that much better than your £1-3k one - so you'd have the smug feeling that these people are being taken for a ride 😂.
I think the whole thing about feeling better about your own system stems from a few things:
People flitting from room to room aren't going to appreciate anything, and their opinion on any room will be null and void.
It takes time to acclimatise to the sound of a system after just having heard another. If you don't, you're just comparing tonal balance.
It takes a lot of time to set up a system well. You can't just arrive in a room you don't know, set up the system and be done with it. It takes hours (sometimes days) of tweaking to start approaching its capabilities, and even then you're held back by room can take room treatment, but you'll never know what you need until you're there. And you can't hire an extra van to bring along all the possibilities.
Believe it or not, some people just aren't very good setting up rooms.
Either that, or they just don't care. And yes, some don't. They're just there to show off expensive stuff. Mentioning no names.
You're also setting up a system for a large listening area, not a single listening position. And those who walk into the room, refuse to sit in empty seats, stand in the doorway, or stand at the back (where all the bass collects) or off to the side (outside many speaker's usable listening window), can't have an opinion, as they didn't hear the system within the intended listening position.
You're going along to an exhibition where you don't know how the rooms sound. You can't appreciate any aspect of a system if you don't know the room. Once you hear a few tracks you know well, you can hear of the room is adding anything unsavoury, and only then can you settle in to the sound of the actual system.
Even the exhibitors have to get to know the room before they can start to tweak the system and try and get out of it what they know it's capable of.
You never get out of the system what it's fully capable of.
If you don't know the music, you have no reference point. And I've always classed electronic music as a bit of a cheat. It usually sounds great on anything. What you need is real instruments and voices. Something real that you know how it should sound.
If you heard any of those systems at home, it would sound quite different, as you already know your own room. You know exactly how your system sounds in it, and once acclimatised to the different sound the better system presents, you'll far more easily be aable to appreciate just how much better it is than your own. It's one reason why I actually hold very few single product demos, as it means nothing. The product needs to be experienced in your own listening environment, on your own system, with your own music. And that's somewhere where you'll be far more relaxed and open to its capabilities.