I think sometimes it's a case of meanness, but other times, if someone dies not have a tight budget, then it actually does not occur to them that things may seem extortionate to someone with less money. A couple of friends, loaded, generous, but completely unaware that ordering double G and Ts in a rare visit to a pub during our lean years was costing our two months entertainment budget. No idea. Have a look at the folk in charge, if money has always been plentiful I think such people can't imagine a scenario where every penny counts. We've been on both sides of the fence and I hope are much more sensitive to what seems fine for us but may be a push or a nightmare for other friends depending on their circumstances. Separate bills just makes it easier if you are the ones with less dosh. Or, as my husband, generous and lovely, though it drove me to despair when we were the impoverished ones, just pay for everyone ?!!