What part of "free" don't you understand.


Harrah's will determine an overall theoretical and property specific theoretical for each player. This allows them to offer comps (and offers/perks) at other properties, based on your play (theoretical) at another property.
The web-based TR hotel room booking system uses this theoretical to determine your room rate (or comp).
This is one of the big advantages of TR, as your play @ one Harrah's casino, can get you free rooms (and other perks) at other Harrah's properties around the country.