Think of it as food, rather than beds/bed spaces, if that helps.
For argument's sake, you've planned (and paid for) 12 sandwiches each for the time you're there. LA couple have each taken their 12 sandwiches and put them in a locked fridge, but they're now eyeing up yours and Dublin's sandwiches and thinking "Gosh, 12 sandwiches would be nice, but I'm sure they could each manage with 6 and wouldn't be starving. That way, we could give the rest of their sandwiches to our friends, so they'd have 6 each - that's only fair for 6 to be the standard number for everybody. Actually, 6 is still a big stack - they could easily put up with 4 each instead of 6, so that would free up another two portions of 4 sandwiches, so we can give those to two other people. Yes, that would be nice. Sharing is caring and we're not really here for food - it's the time we spend together with old friends and the chance to make new ones, so nobody should be selfish. Yep, 4 sandwiches each is plenty."
Then, after making sure that as many people can benefit as possible, they excitedly call you in and give you your sandwiches: "Hey, everybody, you've got FOUR each - they're tasty, deep-fill ones, so it'll be plenty to stop you starving!"
Only then, once they've prioritised giving you all of your sandwiches, do they excuse themselves as they have something they need to do. You're all left thinking that, actually, it's far from ideal, but at least you all got the same. Wait, they didn't get theirs, did they? They'll be so hungry the whole time - you hope they don't take too long doing whatever it is they had to do, so they can come and eat as well - all you know is that you saw them going towards the kitchen with a big key labelled 'Beko'. You've all got to look out for each other and make sure they get fed too, they can always have some of yours if necessary, as you've each got 4; what are friends for, eh?
For some bizarre reason now, I keep thinking of the River Orwell in Suffolk....