Response from the Cosmo:
To explain our Resort Fee, any reservations that were made before December 2nd, 2012 are not subject to the required Resort Fee. Upon check in, a front desk representative may ask if you would like to purchase the Resort Fee bundle, to provide you access to these benefits: Wireless Internet, Local & Long Distance Phone Calls (within continental US), and access to the Fitness Center.
The Cosmopolitan of Las Vegas has not yet decided if Marriott Rewards members will be exempt from this charge. As of now, the charge is required by any and all guests that stay with us.