Rack Rate is typically very high, because typically a hotel can never legally charge more than the posted Rack Rate (or Rack Rates, for hotels that have a different Rack Rate for each season), and there is typically some work involved in changing the Rack Rate. One main context for the Rack Rate these days is preventing price gouging. With a Rack Rate established, hotels can increase their rates up to that point, due to unexpected higher demand, without fear of being accused of price gouging. The other main context for the Rack Rate is the target of this thread: establishment of a baseline for discounts. Rack Rates reflect the differences in value from room-to-room within a resort, so most discounting can just be an index applied to the Rack Rate.