To anyone who books this rate and finds out they didn't get a stay credit, I would recommend calling Customer Service and making a stink. Play dumb and say you had no idea it wouldn't be counted as a stay, nowhere was it indicated in the small print, any you fully expect a stay credit to be given. Personally, if it weren't for what I have read on this thread, I would have no idea there was even a possibility of not getting a stay credit. If you protest vehemently enough I suspect you'll get thrown some kind of a bone; a "good will" stay credit or some extra Hilton points.