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Hotels offer free upgrades to their customers all the time. Corporate clients usually get free upgrades for the obvious reasons that their companies bring in more revenues to the hotel. Unfortunately, Mr. Joe Public will not have the same treatment unless he knows a tip or two on how to ask for free upgrades before he arrives at the hotel.
from: http://ezinearticles.com/?Why-Booking-With-Larger-Hotels-Could-Improve-Your-Chances-of-Having-a-Complimentary-Upgrade&id=5026644