Did anyone sign up for this back in the day? "From now through Monday, November 29, 2010 book a weekend night at any hotel in the IHG Family of Brands. Then when you stay a Friday, Saturday or Sunday night between November 1, 2010 and April 30, 2011 you qualify to earn a $50 flight credit." I did, got 2 codes, but they seem a bit useless given the rules and restrictions. Has anyone used them?