I really don't see why you are confused?? You post came off with an attitude like you did not care if you killed the deal for everyone in the future, because you got what you wanted, plus extra. ((shrugs))
Ya know? I am new to this thread too, but I have read a TON and watch and learn. It seems newbies come in and see something that someone got to work, and then go into the store and raise all sorts of flags by trying to get it to work for them (asking employees about it) Maybe it was only good online, maybe it is was only good with a certain credit card, maybe it was only good for one day.