Plus they do this in their own way by overbooking. Their top customers are taken care of, as both Plat and PP have the override capability; although that won't matter at a hotel that has been fully contracted for a conference/special event. I am sure some hotels may be heavily overbooked as a result of Plat overrides. Much more efficient as it is very low overhead, and I am guessing that in most cases the walk rate is quite low.