Yes it's a bit like buying rounds or dinner when you go out with friends. You don't have to keep an exact tally but you all usually know if someone is skimping

Yes it's a bit like buying rounds or dinner when you go out with friends. You don't have to keep an exact tally but you all usually know if someone is skimping or only offers to pay at the cheaper venues (and this might be OK among friends if we are all in different financial situations which is an important part of a favour economy).