Hotel rooms have a very finite shelf life. If you have rooms unoccupied overnight, then that revenue is gone forever. Because of this, many hotels offer discounts to late bookers, and this can be quite substantial. It's better to get 25% of the standard charge, rther thn nothing for an empty room. A site that brings together lte booking holidaymakers, and hotels with potentilly empty rooms is a boon for both parties. The easiest way to find these roomsis to search for late hotel deals.