Paul, that doesn't make sense to me. You can't understand why a busy room, full of dancers, can have a better atmosphere than an emptyish one? Well if you're out for a sociable night out it does matter, otherwise you might as well stay at home and just have a couple of mates round.
Me.....I'll wander from one to the other, unaffected by the bias of others as I like it all. I do pick my venues according to what I'm after though.
Unfortunately some aren't prepared to leave their comfort zone and hear what else is on offer. I've noticed this particularly when there isn't immediate access between rooms and this does sound like Gloucester if the rooms were on different floors. Swap the rooms around for an hour or so - and see if everyone gets up and moves
Other than that - I'll go with Dave Abbots Factor number 3