This happens particularly when I host groups of friends. Not everybody arrives/leaves on the same day as my city is where people tend to gather (i.e. main international airport) and spend a few days before going to the most touristic attraction in the entire country. We end up either manually refunding or requesting money for the extra guest fees as the platform only allows a set number of guests for the entire stay when placing a reservation. I foresee that with the new payment features offered by Airbnb (split payment, pay 50% now then later) there will be more groups of friends enticed to travel...and not necessarily all of them can arrive on the same day. It would be great if that could be fixed.